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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
Number of Barr bodies in XXXX female would beA. 1B. 2C. 3D. 4 |
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Answer» Correct Answer - C The number of Barr bodies in XXXX female are 3. Barr body is a condensed mass of chromatin found in the nuclei of placental mammals which contain one or more X-chromosomes, so named after its discovers Murray Barr. The number of Barr bodies is one less than the number of X-chromosomes present. |
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| 152. |
Male XX and female XY sometime occur due to :A. deletionB. transfer of segments in X and Y-chromosomesC. aneuploidyD. hormonal imbalance |
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Answer» Correct Answer - D Hormondal inbalance may lead to developmentof male characters in female or vice versa. Deletion is the removal of one of few nitrogenous bases from a nucleotide chain. Aneuploidy is a chromosomal aberration in which certain chromosomes are present in extra copies or certain are deficient in number. |
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| 153. |
One of the following is not the tyoes of blood groups or blood factorsA. Lewis and DuffyB. Buffs and KipsC. ABO and RhD. Rh and MN |
| Answer» Correct Answer - B | |
| 154. |
If a child has O type of blood group and the father B type, the genotype of the father will beA. `I^(O)I^(O)`B. `I^(A)I^(B)`C. `I^(O)I^(B)`D. `I^(B)I^(B)` |
| Answer» Correct Answer - C | |
| 155. |
RR (red) Antirrhinum majus is crossed with white (rr) one. Offsprings (Rr) are pink. This is an example of:A. dominant-recessiveB. incomplete dominanceC. hybridD. supplementary genes |
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Answer» Correct Answer - B The pink colour of the offspring is an example of incomplete dominance. In which the expression of the characters in `F_(1)` individual is intermediate of the factors as found in homozygous state. |
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| 156. |
Two nonallelic genes produces the new phenotype when present together but fail to do so independently then it is called : -A. epistasisB. polygeneC. non-complementay geneD. complementary gene |
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Answer» Correct Answer - D In complementary genes, two separate pair of genes interact to produce the phenotype in such a way that neither of the dominant genes is expressive unless the other one is absent. |
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| 157. |
Genes exhibting multiple effects phenotype are known asA. Complementary genesB. Pleiotropic genesC. CistronsD. Pseudogenes |
| Answer» Correct Answer - B | |
| 158. |
When a pink flowered Antirrhinum plant is test crossed, then phenotypic ratio in resulting progenies isA. 1 Red : 1 WhiteB. 3 Red : 1 WhiteC. 2 Pink : 1 WhiteD. 1Pink : 1 White |
| Answer» Correct Answer - D | |
| 159. |
Lack of independent assortment between two genes A and B would be due toA. Crossing overB. LinkageC. RepulsionD. Recombination |
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Answer» Correct Answer - B Lack of independent assortment between two genes A and B would be due to linkage. |
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| 160. |
Two or more independent genes present on different chromosomes which determine nearly same phenotype are calledA. Supplementry genesB. Complementry genesC. Duplicate genesD. None of these |
| Answer» Correct Answer - C | |
| 161. |
Whereas the number of chromosomes is reduced to half in first reduction division of meiosis, then what is the need for second mitotic divisionA. For the segregation of replicated chromosomesB. For equal distribution of haploid chromosomesC. For the formation of four gametesD. For equal distribution of genes on chromosomes |
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Answer» Correct Answer - A (a) The reduction of DNA content does not occur in meiosis- I . Truely haploid nuclei in terms of DNA contents as well as chromosomes number are formed in meiosis- II . When the chromatids of each chromosome are separated into different nuclei. Thus meiosis- II is necessary . |
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| 162. |
Independent assortment of genes does not take place when:A. Genes are located on homologous chromosomesB. Genes are linked and located on same chromosomeC. Genes are located on non-homogenous chromosomesD. All of these |
| Answer» Correct Answer - B | |
| 163. |
Due to the cross between `"TTRr" xx "ttrr"` the resultant progenies show what percent of tall, red flowered plants ?A. `50%`B. `75%`C. `25%`D. `100%` |
| Answer» Correct Answer - A | |
| 164. |
An organism with two identical alleles for a given trait is:A. HomozygousB. SegregatingC. DominantD. A hermaphrodite |
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Answer» Correct Answer - A (a) The homozygote is pure for the character and breeds true, that is, it gives rise to offspring having the same character on self breeding. E.g., TT or it. |
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| 165. |
Assertion : A gamete contains a single allele for each trait. Reason : During gametogenesis, the two alleles of each trait segregate, on passing into each gamete at random.A. If both A and R are true and R is the correct explanation of A.B. If both A and R are true and R is not the correct explanation of A.C. If A is true but R is falseD. If both A and R are false |
| Answer» Correct Answer - A | |
| 166. |
An organism with two identical alleles for a given trait is:A. dominantB. hybridC. heterozygousD. homozygous |
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Answer» Correct Answer - D An organism with two identical alleles is homozygous, e.g. rr, tt, RR, T T, etc. |
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| 167. |
An allele is dominant if it is expressed in:A. both homozygous and heterozygous statesB. second generationC. heterozygous combinationD. homozygous combination |
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Answer» Correct Answer - A Dominant allele expresses itself both in homozygous and in heterozygous states. |
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| 168. |
Segregation of Mendelian factors (no linkage no crossing over) occurs during:A. anaphase-IB. anaphase-IIC. diploteneD. metaphase-I |
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Answer» Correct Answer - A At the end of anaphase-I, two groups of chromosomes (one at each pole) are produced. Each such group is having half the original number of chromosomes present in the parent nucleus. So, anaphase-I results in the reduction of chromosome number to half and segregation of Mendelian factors. |
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| 169. |
Failure of segregation of chromatids during cell division results in the gain or loss of chromososmes, this is called asA. AeuploidyB. EuploidyC. Reverse tandem duplicationD. Substantive mutation |
| Answer» Correct Answer - B | |
| 170. |
Who argued that the pairing and separation of a pair of chromosomes would lead to the segregation of a piar of factors they carried?A. Sutton and BoveriB. T.H. MorganC. Alfred SturtevantD. Both B and C |
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Answer» Correct Answer - A Sutton and Boveri argued that the pairing and separation of a pair of chromosomes would lead to the segregation of a pair of factors they carried. |
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| 171. |
Mammorary glands in female, moustaches and beard in muman males are example ofA. Sex-linked traitsB. Sex-limited traitC. Sex differentiating traitsD. Sex determining traits |
| Answer» Correct Answer - B | |
| 172. |
Fruit colour in squash is an example ofA. Recessive epsitasisB. Dominant epistasisC. Complementary genesD. Inhibitory genes |
| Answer» Correct Answer - B | |
| 173. |
the linkage map of X -chroosomes of fruitfly has 66 units with yellow body gene (y) at one end and bobbed hair (b) gene at the other end the recomnation frequency between these two genes (y and b) should be :A. `le 50%`B. `100%`C. `66%`D. `gt 50%` |
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Answer» Correct Answer - B The actual distance between two genes is said to be equivalent to the percentage of crossing over between these two genes. Since, the two genes lie at the ends of the chromosome, there are 100% chances of their segregation during crossing over. |
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| 174. |
A pleiotropic geneA. is expressed only in primitive plantsB. is a gene evolved during PlioceneC. controls a trait only in combination with another geneD. controls multiple traits in an individual |
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Answer» Correct Answer - D Pleiotropic gene is a gene that controls multiple traits is an individual. It is also called polyphenic gene, e..g. phenylketonuria causing multiple adverse effects due to the mutation in a single gene coding for enzyme phenylalanine hydroxylase. |
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| 175. |
Sex is determined in human beingsA. By ovumB. At time of fertilizationC. 40 days after fertilizationD. Seventh to eight week when genitals differentiate in foetus |
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Answer» Correct Answer - B During spermatogenesis among males, two types of gametes are produced. 50 per cent of the total sperm produced carry the X-chromosome and the rest 50 percent has Y-chromosome besides the autosomes. Females, however, produce only one type of ovum with an X-chromosome. There is an equal probability of fertilisation of the ovum with the sperm carrying either X or Y chromosome. In case the ovum fertilises with a sperm carrying X-chromosome the zygote develops into a female (XX) and the fertilisation of ovum with Y-chromosome carrying sperm results into a male offspring. Thus, it is evident that it is the genetic makeup of the sperm that determines the sex of the child. It is also evident that in each pregnancy there is always 50 per cent probability of either a male or a female child. |
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| 176. |
Sex of a human child is determined byA. Size of the egg at the time of fertilizationB. Size of the sperm at the time of fertilizationC. Sex chromosome of fatherD. Sex chromosome of mother |
| Answer» Correct Answer - C | |
| 177. |
A man whose father was colour blind marries a woman who had colour blind mother and normal father what precentage of male childeren of this couple will be colour blindA. 0.25B. 0C. 0.5D. 0.75 |
| Answer» Correct Answer - C | |
| 178. |
Two dominant non-allelic genes are 50 map units apart.The linkage isA. cis typeB. trans typeC. completeD. absent/incomplete |
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Answer» Correct Answer - D Chromosome mapping is based on two genetic principles (a) The frequency of crossing over between two genes is directly proportional to the distance between them in the chromosome. (b) Genes are arranged in a linear order in the chromosome. 50 map unit distance between the genes is quite enough to change the cis arrangement of dominant genes into trans. So, there is no fixed linkage present. |
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| 179. |
Sex is determined in human beingsA. by ovumB. at the time of fertilisationC. 40 days after fertilisationD. seventh to eight week when genitals differentiate in foetus |
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Answer» Correct Answer - B In human beings male produces two types of sperms. 50% of them carry X-chromosome and 50% have Y-chromosome. Sex in human beings is determined at the time of fertilisation because sex of baby depends upon which sperm fertilises the ovum. |
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| 180. |
A man whose father was colour blind marries a woman who had a colour blind mother and normal father. What percentage of male children of this couple will be colour blindA. 0.5B. 0.75C. 0.25D. 0 |
| Answer» Correct Answer - A | |
| 181. |
Mr kapoor has Bb autosomal gene pair and d allele sex linked.What shallbe proportion of Bd in sperms |
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Answer» Correct Answer - C Mr. Kapoor will have the genotype Bb, d, so `1//4th` of the sperms will have Bd. |
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| 182. |
Assertion: In each pregnancy there is always 50 per cent probability of either a male or a female child. Reason: The genetic makeup of the sperm determines the sex of child.A. If both assertion and reasons are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false. |
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Answer» Correct Answer - A In each pregnancy there is always 50 per cent probability of either a male or a female child. The genetic makeup of the sperm determines the sex of the child. |
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| 183. |
A family has five girls and no son. Probability of son as the 6th child will beA. `50%`B. `75%`C. FullD. No chance |
| Answer» Correct Answer - A | |
| 184. |
Test cross is a cross betweenA. `"Hybrid" xx "Dominant parent " ("Tt"xx "TT")`B. `"Hybrid" xx "Recessive parent" ("Tt" xx "TT")`C. `"Hybrid" xx "Hybrid" ("Tt" xx "Tt")`D. All of the above |
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Answer» Correct Answer - B It is clear that though the genotypic ratios can be calculated using mathematical probability, by simply looking at the phenotype of a dominant trait, it is not possible to know the genotypic composition. That is, for example, whether a tall plant from `F_(1) " or " F_(2)` has TT or Tt composition, cannot be predicted. |
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| 185. |
One of the parents of a cross has a mutation in its mitochondiria. In that cross, that parent is taken as a male. During segregation of `F_(2)` progenies that mutation is found inA. All the progeniesB. Fifty precents of the progeniesC. One-third of the progeniesD. None of the progenies |
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Answer» Correct Answer - D (d) Beacause mitochondrial gens also show maternal inheritance mitochdrical genes also show maternal inheritance because all the the mitochonria a zygote has come from the cyoplasm of the ovum. |
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| 186. |
One of the parents of a cross has mutation in mitochondria. In that cross, that parent is taken as a male. During segregation of `F_(2)`-progenies that mutation is found inA. one-third of the progeniesB. none of the progeniesC. all of the progeniesD. fifty per cent of the progenies |
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Answer» Correct Answer - B In the present case the male parent (not female) had mutation in mitochondria, there are negligible chances of the mutation being inherited. It is the female reproductive cell which usually carries more cytoplasm and cytoplasmic organelles than the male cell and hence, naturally would be expected to influence non-Mendelian traits. |
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| 187. |
Absence or excess or abnormal arrangement of one or more chromosomes results inA. Point mutationB. Chromosomal disordersC. Mendelian disordersD. Gene mutation |
| Answer» Correct Answer - B | |
| 188. |
Two genes R and Y are located very close on the chromosomal linkage map of maize plant. When RRYY and rryy genotypes are hybridized the `F_(2)` segregation will showA. higher number of the recombinant typesB. segregation in the expected 9 : 3 : 3 : 1 ratioC. segregation in 3 : 1 ratioD. higher number of the parental types |
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Answer» Correct Answer - D Higher number of the parental types formed when RRYY and rryy genotypes are hybridised giving the condition that R and Y genes are closely linked. Law of independent assortment does not applicable when the gene of different character occupy the same homologous chromosome i.e. are linked gene. |
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| 189. |
If a homozygous red flowered plant is crossed with a homozygous white flowered plant, the offspring would beA. all red floweredB. half red floweredC. half white floweredD. all white flowered |
| Answer» Correct Answer - A | |
| 190. |
Pure line breed refers toA. homozygosityB. heterozygosityC. LinkageD. both (B) and (C) |
| Answer» Correct Answer - A | |
| 191. |
A male honeybee has 16 chromosomes whereas, its female has 32 chromosomes. Give one reason. |
| Answer» In honeybees, unfertilized egg devlops into a male and has 1 N chromosmes, whereas, fertilized eggs developes into a female (2N chromosomes) | |
| 192. |
The sex determination pattern in honeybee is calledA. Female haploidyB. HaplodiploidyC. Gametic diploidyD. Gametogony |
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Answer» Correct Answer - B Haplodiplocity is a type of sex determination in which the male is halpoid while female is diplod. It occurs in some insect like honey bees, ants and wasps. |
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| 193. |
Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statementA. Both are due to a quantitative defect in globin chain synthesis.B. Thalassemia is due to less synthesis of globin molecules.C. Sickle cell anaemia is due to a quantitative problem of globin molecules.D. Both are due to a qualitative defect in globin chain synthesis. |
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Answer» Correct Answer - B Thalassemia is due to less synthesis of globin molecules. |
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| 194. |
When both alleles express their effect on being present together, the phenomenon is calledA. DominanceB. CodominanceC. PseudodominanceD. Amphidominance |
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Answer» Correct Answer - B When both alleles express their effect on being present together, the phenomenon is called condominance. |
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| 195. |
What would be the number of chromosomes of the aleurone cells of a plant with 42 chromosomes in its root tip cells?A. 21B. 42C. 63D. 84 |
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Answer» Correct Answer - C (c) Aleurone is triploid and root tip is diploid . |
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| 196. |
The offspring of mating between two pure breeding strains calledA. HybridB. ProgenyC. CybridD. Heterosis |
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Answer» Correct Answer - A The offspring of mating between two pure breeding strains are called Hybrid. |
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| 197. |
Mating among close relations is referredA. Permanent marriageB. Line breedingC. In breedingD. Cross breding |
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Answer» Correct Answer - C The process of mating among closely related individuals is known as inbreeding |
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| 198. |
Chromosomal theory of inhertance was bassed on :A. Sex linkageB. Segregation of genesC. Diploidy and haploidyD. presence of sex chromosomes |
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Answer» Correct Answer - b bThe behaviour of homologous chromosomes during meiosis (their , segregation and independent assortment ) and their reunion in fertilization confirmed that the genetic material occurs in the chromosomes and formed the basis of chromosomal theory of inheritance . |
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| 199. |
Depending upon size and cetromere position, the 46 chromosomes have been divided into a number of groupsA. 6B. 5C. 7D. 10 |
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Answer» Correct Answer - C (c) Depending upon the position of centromere and relative length of two arms , human chromosome are of three types - metacentric , submetacentric and acrocentric . The photograph of chromosomes are artifically arranged in the order of descending length is seven group (A to G). |
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| 200. |
The change in single base pairA. Results in new speciesB. Always change the polypetide chainC. May not change the phenotypeD. Always changes the Phenotype |
| Answer» Correct Answer - C | |