InterviewSolution
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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.
| 101. |
If a mother and father both have one mutant gene for a disease with an autosomal dominant inheritance, what is their risk of having an affected child? |
| Answer» Correct Answer - D | |
| 102. |
From a single ear of corn, a farmer planted 200 kernels which produced 140 tall and 40 short plants. The genotypes of these offspring are most likelyA. TT and tt onlyB. TT and Tt onlyC. Tt and tt onlyD. TT, Tt and tt |
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Answer» Correct Answer - D TT, Tt and tt |
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| 103. |
Molecular basis of organ differentiation depends on the modulation in transcription byA. transcription factorB. anticodonC. RNA polymeraseD. ribosome |
| Answer» Correct Answer - A | |
| 104. |
Who proved that genes are located on chromosomes?A. Sutton and Boveri (1902)B. Johanssen (1909)C. Morgan (1910)D. Muller (1927) |
| Answer» Correct Answer - C | |
| 105. |
Scientist who was awarded nobel prize for finding to be linearly arranged on chromosomes wasA. WolfB. PunnetC. MorganD. Swammerdan |
| Answer» Correct Answer - C | |
| 106. |
Which of the following characters of pea was not studied by mendel?A. Height of plantB. Size of seedC. Clour of podD. Shape of pod |
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Answer» Correct Answer - B Size of seed |
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| 107. |
In man brown eyes are dominant over blue eyes. A blue eyes mother and brown eyed father have 50% blue eyes and 50% brown eyes childred. What type of cross it involved?A. Back crossB. Test crossC. Out crossD. Reciprocal cross |
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Answer» Correct Answer - B Test cross |
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| 108. |
Which of the following statements is not true of two genes that show 50% recombination frequency?A. The genes show independent assortmentB. if the genes are present n the same chromosome, they undergo more than one crossovers in every meiosisC. the genes may be on different chromosomesD. the genes are tightly linked |
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Answer» Correct Answer - D if two genes a 50% recombination frequency it means that they are not linked and show independence assortment. They may be on the same chromosome or are more likely to be on different chromosomes. If they are on the same chromosome then the distance between then in large i.e., nearly 50cm. we know that larger the distance between genes on the same chromosome greater are the chances of more than one cross overs in meiosis. |
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| 109. |
`"F"_(2)` generation in Mendelian cross showed that both genotypic and phenotypic ratios are same as `1 : 2 : 1`. It represents a case of:A. Dihybrid crossB. Monohybrid cross with complete dominanceC. Monohybrid cross with incomplete dominanceD. Co-dominance |
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Answer» Correct Answer - C In both incomplete dominance and co-dominance, the genotypic and phenotypic ratios are 1:2:1. probably option (3) is better answer, since monohybrid cross is mentioned with it. |
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| 110. |
What is true for thalassaemia?A. Nutritional disorder leading to anaemiaB. Autosomal recessive disorder leading to clotting abnormalitiesC. Autosomal recessive disorder leading to reduced haemoglobin synthesisD. Autosomal dominant disorder leading to reduced haemoglobin synthesis |
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Answer» Correct Answer - C The option (c) is also correct i.e., the trait under study could not be color blindness. As per pedigree mother does not seem to be a carrier of sex linked recessive disorder as the symbol for carrrier of sex linked recessive disorder has not been used. if mother is not a carrier of sex linked recessive disorder, then none of the daughters can be a sufferer. but still (a) is a better choice. |
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| 111. |
What is true for night blindness and haemophilia ?A. Nutritional deficiency disordersB. X-linked recessive disordersC. Autosomal recessive disordersD. autosomal dominant disorders |
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Answer» Correct Answer - B The acquired type of night blindness is due to defienciency of vitamin A. the congenital night blindness can occur as an autosomal dominant, autosomal recessive or X-linked recessive conditions. |
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| 112. |
The incorrect statement with regard to haemophilia isA. It is a dominant diseaseB. A single protein involved in the clotting of blood is affectedC. it is a sex-linked diseaseD. it is a recessive disease |
| Answer» Correct Answer - A | |
| 113. |
which mendelian idea is depicted by a cross in which the F1 generation resembles both the parentsA. inheritance of one geneB. co-dominanceC. incomplete dominanceD. law of dominance |
| Answer» Correct Answer - B | |
| 114. |
Sex mechanism in Drosophila isA. XO female: XX maleB. XY female: XX maleC. XX female: XX maleD. none of these |
| Answer» Correct Answer - B | |
| 115. |
What would be the sex of Drosophila with 3A+XXY genetic constitution?A. MaleB. FemaleC. Meta femaleD. inter sex |
| Answer» Correct Answer - D | |
| 116. |
Test cross in plants or in Drosophila involves crossingA. Between two genotypes with recessive traitB. Betwee two `F_(1)` hybridsC. The `F_(1)` hybrid with a double recessive genotypeD. Between two genotypes with dominant trait |
| Answer» Correct Answer - C | |
| 117. |
Nucleosomes give beaded appearance to chromosomes. They help in packing of DNA in the chromosomes. A nucleosome hasA. about 5 turns of DNAB. 8 histone molecules of 4 types (2 mols each of `H_(2)a`, `H_(2)b`,H_(3) and H_(4)`)C. 400 nitrogen base pairsD. all of the above |
| Answer» Correct Answer - B | |
| 118. |
A test cross is carried out:A. Assess the number of alleles of a geneB. Determine whether two species or varieties will breed successfullyC. determine the genotype of a plant at `F_(2)`D. Predict whether two traits are linked |
| Answer» Correct Answer - C | |
| 119. |
A normal-visioned man whose father was colour-blind, marries a woman whose father was also colour-blind. They have their first child as a daughter. What are the chances that this child would be colour-blind?A. zero percentB. 0.25C. 0.5D. 1 |
| Answer» Correct Answer - A | |
| 120. |
A man with blood group A marries a woman having blood group AB. Which of the following types in the progeny of this couple would show that the man is heterozygousA. Type OB. Type AC. Type BD. all of these |
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Answer» Correct Answer - C Type B |
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| 121. |
Polygenic traits includeA. skin colour and weight in human beingsB. kernel colour in wheatC. cob size of maizeD. all of the above |
| Answer» Correct Answer - D | |
| 122. |
A woman (whose father is colour bling but mother is normal) marries a haemophiliac man with hypertichosis. What percentage of progeny will show genotypically any two of the traits out of the three mentioned above at a given time? |
| Answer» Correct Answer - C | |
| 123. |
If `F_(1)` generation has all tall plants and ratio of `F_(2)` generation is 3 tall : 1 dwarf, it provesA. Law of independent assortmentB. law of segregationC. law of dominanceD. incomplete dominance |
| Answer» Correct Answer - B | |
| 124. |
In a testcross involving `F_(1)` dihybrid flies, more parental-type offsping were produces than the recombinant-type offspring. This indicatesA. chromosomes failed to separate during meiosisB. the two genes are linked and present on the sae chromosomeC. both of the characters are controlled by more than one geneD. the two genes are located on two different chromosomes |
| Answer» Correct Answer - B | |
| 125. |
In `F_(2)` generation, a ratio of 1:4:6:4:1 is obtained instead of 9:3:3:1, when two pairs of genes are considered, it indicatesA. incomplete dominanceB. quantitative inherritanceC. qualitative inheritanceD. pleotropic effect of genes |
| Answer» Correct Answer - B | |
| 126. |
To make a karyotype, chromosomes are photographed during :A. fertilizationB. mitosisC. meiosisD. s-phase |
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Answer» Correct Answer - B Karyotype is the pictorial/photographic representation of all autosomes and allosomes of a somatic diploid cell at mitotic metaphase stage. WBC are taken to make karyotype. When it is represented diagrammatically and arranged homologous pairs in order of decreasing length, it is called Idiogram. |
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| 127. |
If two loci are 10 map units apart, assuming that no multiple cross-oer has taken place, what proportion of the cells formed as a result of meiosis will contain a single crossover in the region between these two loci?A. 0.1B. 0.2C. 0.3D. 0.4 |
| Answer» Correct Answer - A | |
| 128. |
An exception (deviation) to Medelian law of idenpendent assortment isA. crossing overB. incomplete dominanceC. segregationD. linkage |
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Answer» Correct Answer - D linkage |
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| 129. |
Acentric chromosome at mitotic anaphase willA. have circular chapeB. by highly condensedC. lie near the equator and will be left behindD. be condensed and would lie at one of the poles. |
| Answer» Correct Answer - C | |
| 130. |
In a multiple allete system a gamete comes to haveA. several allelesB. three allelesC. one alleleD. two alleles |
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Answer» Correct Answer - C one allele |
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| 131. |
Mitotic chromosomes are stained withA. safraninB. fast greenC. amido blueD. Acetocarmine |
| Answer» Correct Answer - D | |
| 132. |
Highest number of chromosomes is found in the gamete ofA. OnionB. PotatoC. RiceD. Ophioglossum |
| Answer» Correct Answer - D | |
| 133. |
X-chromosomes or X-body was first observed byA. Mendel-1901B. Castle-1910C. Henking-1891D. Bateson-1906 |
| Answer» Correct Answer - C | |
| 134. |
How many chromosomes would you find in a somatic cell of a female with webbed neck, primary amenorrhoea, small undeveloped breasts and ovaries?A. 46B. 47C. 44D. 45 |
| Answer» Correct Answer - D | |
| 135. |
In which stage, you will find lampbrush chromosomes in oocyte of frog?A. In zygotene stageB. Pachytene stageC. In diplotene stageD. Oocyte after fertilization |
| Answer» Correct Answer - C | |