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301.

HJ Muller was awarded Noble Prize for hisA. discovery that chemicals can induce gene mutationsB. discovery that ionizing radiations can induce gene mutationsC. work on gene mapping in DrosophilaD. efforts to prevents the use of nuclear weapons

Answer» Correct Answer - A
HJ Muller was awarded Nobel Prizefor discovering that ionizing radiations can induce gene mutations.
302.

Alleles areA. Alternate forms of a geneB. Pairs of sex chromosomesC. Homologous chromosomesD. None of the above

Answer» Correct Answer - A
Alleles are alternate forms of a gene.
303.

The allele which is unable to express its effect in the presence of another is calledA. Co-dominantB. SupplementaryC. ComplementaryD. Recessive

Answer» Correct Answer - D
The allele which is unable to express its effect is recessive.
304.

Aneuploidy which results in loss of a complete homologous pair of chromosomes isA. TrisomyB. TetrasomyC. NullisomyD. Euploidy

Answer» Correct Answer - C
305.

The dwarfnes in plsnts in `F_(1)` genertion isA. RecessiveB. DominantC. Both the aboveD. None of the ablove

Answer» Correct Answer - A
(a) The factor of an allelic pair which is unable to express its effect in the presence of its contrasting factor in a heterozygote is called recessive factor.
306.

A common test to find the genotype of a a hybird is byA. Crossing of one `F_(1)` progeny with male parentB. Crossing of one `F_(2)` progeny with male parentC. Crossing of one `F_(2)` progeny with female parentD. Studying the sexual behaviour of `F_(1)` progenies

Answer» Correct Answer - A
307.

Out of a population of 800 individuals in `F_(2)` generation of a cross between yellow round and green wrinkled Pea Plants, what would be number of yellow and wrinkled seedsA. 800B. 400C. 200D. 150

Answer» Correct Answer - D
308.

The following figure shows A. Independent assortment of genesB. LinkageC. Chromosomal theory of sex determinationD. Independent segregation of genes

Answer» Correct Answer - A
309.

Which of the following genotype will show the diseased condition in sickle cell anaemia?A. `"Hb"^(A) "Hb"^(A)`B. `"Hb"^(A) "Hb"^(S)`C. `"Hb"^(S) "Hb"^(S)`D. Both B and C

Answer» Correct Answer - C
310.

Fill in the blanks (i) `"_______"` is the degree by which progeny differes from their parents . (ii) Pisum sativum produces a `"_____"` number of offspring and completes its life cycle in `"_______"` season .

Answer» (i) Variation
(ii) Large, one
311.

In his classic experiment on Pea plants, Mendel did not useA. Flower positionB. Seed colourC. Pod lengthD. Seed shape

Answer» Correct Answer - C
312.

Two offspring developed in the same uterus but fom fertilization of two different ova areA. Dizygotic twinsB. Monozygotic twinC. Fraternal twinsD. Both (a) and (c)

Answer» Correct Answer - D
(d) Dizygous also known as fraternal in which twins are promed by simultan uos fertilization of two different ova by two different sperms
313.

For making important contributions in respect of the nature of gene, the Noble Prize was rewarded toA. T.H.MorganB. De VriesC. H.J. MullerD. Darwin

Answer» Correct Answer - A
314.

In humans, most number of genes are located on chrosomeA. 1B. 6C. XD. 21

Answer» Correct Answer - A
315.

The number of autosomes in human female isA. 21B. 22C. 23D. 44

Answer» Correct Answer - D
316.

Which one is a sex linked disorder?A. PhenyketonuriaB. Sickle cell anaemiaC. HaemophiliaD. Thalassemia

Answer» Correct Answer - C
317.

Calculated the sum total of phenotypes and genotypes in `F_(2)` generation if a character is controlled by 2 pair of polygenes.

Answer» Number of phenotypes for polygenes `= 2 n + 1`
`:. (2xx2+1) = 5`
Number of genotypes for polygenes `= 3^(n)`
`:. 3^(2) = 9`
i.e, `5+9=14`
318.

UV radiations causeA. Formation of thymine dimersB. Deletion of base pairsC. Methylation of baseD. Additon of base pairs

Answer» Correct Answer - A
319.

Mendel is famous for his work onA. PisumB. DrosophilaC. NeurosporaD. Oenothera

Answer» Correct Answer - A
320.

Which of the following mandel has selected for his expermentA. Garden peaB. Pigeon peaC. Sweet peaD. Moong

Answer» Correct Answer - A
321.

How many different kinds of gametes will be produced by a plant having the genotype AABbCC?A. NineB. TwoC. ThreeD. Four

Answer» Correct Answer - B
322.

Mendel chose pea plants because they:A. They were cheapB. They were having seven pairs of contrating charactersC. They were easilty availableD. Of geat economic importance

Answer» Correct Answer - B
(b) Mandel selected these 7 characters-
(1) Stem length (2) Flower position
(3) Pod shape (4) Pod colour
(5) Seed shape (6) Seed colour (7) Seed coat colour
323.

Euplodiy is best explanined byA. Exact muliple ofa haploid set of chromosomesB. One chromosome less than the haploid set of chromosomesC. One chromosome more than the haploid set of chromosomesD. One chromosome more than the diploid set of chromosomes

Answer» Correct Answer - A
(a) the term euploidy `(eu="good"+"ploud"="multiple )` is applied to organisms with chromosame numberser number that are multiplles of same basic number `e.g,x,2x,3x,4x5x,6x,` etc.
324.

A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at telophase stage. There is no formation of cell plate and thus the cell is containing more number of chromosomes as compared to other dividing cells. This would result inA. polyploidyB. somaclonal variationC. polytenyD. aneuploidy

Answer» Correct Answer - A
Polyploid cells have a chromosome number that is more than double the haploid number, e.g. Triticum aestivum (wheat) is a hexaploid (6n).
325.

Hybrid vigour is induced byA. Clonal selectionB. Crossing of plantC. Crossing two plantsD. Species differentiation

Answer» Correct Answer - C
326.

The phenotype of an individuals may be affected if the modified allele producesA. Only (a) is correctB. (a) and (c ) are correctC. (b) and (c ) are correctD. Only (c ) is correct

Answer» Correct Answer - B
327.

Genes for cytoplasmic male sterility in plants are located inA. nuclear genomeB. cytosolC. chloroplast genomeD. mitochondrial genome

Answer» Correct Answer - D
Mitochondria are originated from pre-existing mitochondri. These are semi-autonomous, living organelles present in all eukaryotic cells. These contain DNA (mtDNA). The available evidences show that the genes located in mtDNA control the cytoplasmic male sterility.
328.

Genetic map is one that :A. shows the stages during the cell divisionB. shows the distribution of various species in a regionC. establishes sites of the genes on a chromosomeD. establishes the various stages in gene evolution

Answer» Correct Answer - C
Genetic map is a diagram which shows the relative position of genes on a chromosome. Strutevant in 1911 prepared the first genetic map of two chromosomes of fruit fly.
329.

Test cross is a cross between:A. Hybrid X dominant parentB. Hybride X Recessive parentC. Hybrid X Hybrid parentD. Two distantly related species

Answer» Correct Answer - B
330.

Phenotypic ratio in plant Snapdragon in `"F"_(2)` is:A. `1:1`B. `2:1`C. `3:1`D. `1:2:1`

Answer» Correct Answer - D
331.

Which of the following conditions is called monosomic?A. `2n+1`B. `2n+2`C. `n+1`D. `2n-1`

Answer» Correct Answer - D
332.

Marriage between close relatives should be avoided because it induces more:A. More mutations can occurB. More recessive defects are likely to appearC. More chance there for Rh blood group anomaliesD. More chances are there for multiple births

Answer» Correct Answer - B
(b) Marriage between close rlatives and ccousins is not adviable beacause recessive lrthals asre carried in heteroygous consitions and express themselves only when matng takes place between two carrir individuals or close relatives.
333.

Donors and receipts in a blood transfusion process can beA. Only father and sonB. Only brother and sisterC. Only maternal uncle and nieceD. All of these

Answer» Correct Answer - D
334.

Detection of blood group is done by agglutisation test using antiserum. According to thisA. If the blood shows coagulation with antiserum B, the blood group is BB. If the blood shows coagulation with both antiserum A and B, the blood group is OC. If the blood shows coagulation with both antiserum A, the blood group is ABD. None of these

Answer» Correct Answer - A
335.

Which terms have been used for the hereditary units and by whom ?

Answer» Term factor was used for heredary units by Correns, elements by Mendel and gene by Johannsen.
336.

How can a dihybride ratio be derived from monohybride ratio in simple dominstant -recessive crosess?

Answer» By multiplying the monohybrid ratio of 2 traits `(3:1xx3:1=9:3:3:1)`
337.

If the frequency of parental forms is higher than `25%` in a dihybride test-cross. What does that indicate about the two genes involved ?

Answer» homozygous condition
338.

Ratio of complementary genes isA. `9:3:4`B. `12:3:1`C. `9:3:3:4`D. `9:7`

Answer» Correct Answer - D
339.

Cite one example of complementary genes.

Answer» Flower colour in sweet pea.
340.

Define condominant and complementary genes.

Answer» The llelic genes which genes which , present together in an individual, express their traits independently instead of showing dominance-recessive relationsphip are called codominant gene. Two independent pairs of genes, which interact to produce a trait together, but each dominant gene alone does not shw its effect, are termed complementary genes.
341.

Gyandromorphs develop in Drosophila when the two cells in the two-called proembryo will have one of the following chromosomal setsA. 2A+XX in one cell and 2A+X in the otherB. 2A+X in both the cellsC. 2A+XXX in both the cellsD. All of the above

Answer» Correct Answer - A
Gynandromorphs are foumed due to misadivison of chromosomes and starts as female with 2A + 2X chromosomes . One of the X- chromosomes and the other 2A + 2X.
342.

A medical technician while observing a human blood smear under the microscope notes the presence of barrbody close to the nuclear membrane in the WBC. This indicates that person under investigation isA. Colour blindB. HaemophilicC. Normal femaleD. Normal male

Answer» Correct Answer - C
Barr body is characteristic feature of female.
343.

When both alleles express their effect on being present together, the phenomenon is calledA. Co-dominanceB. DominanceC. Incomplete dominanceD. Pseudodominance

Answer» Correct Answer - A
344.

Geneetically active area of chromosome is calledA. EuchromatinB. HeterochroatinC. HeaptanD. Cistron

Answer» Correct Answer - A
(a) Euchromatin or dynamic chromatin is relatively expended and open. It has the potential of being actively transcribed .
345.

Fill in blanks (w.r.t. experimental material used by Morgan) (i) Females are easily distinguishable from the male by the `"_____"` body size. (ii) It has many type of hereditaly variations that can be seen with `"____"` power microscope. (iii) Male individuals have hetromorphic`"________"` .

Answer» (i) Large
(ii) Low
(ii) Sex chromosomes
346.

Identify the type of inheritance shown in the following pedigree diagram

Answer» The type of inheritance is cytoplamic or mitochondrial inheritance because the character in the given pedigree analysis is inherited only through female.
347.

Morgan (1910) made the following crosses in Drosophila. Write the results of these crosses in `F_(1)` generation. (a) The white eyed male was crossed with red eyed female. (b) The females of `F_(1)` generation were crossed with white eyed males. (c) White eyed females were crossed with red eyed males.

Answer» (a) All the files of `F_(1)` generation were red eyed.
(b) It was test cross and the result was 1 red eyed female : 1 white eyed male.
(c)All the males were whit eyed an all the femals were red eyes.
348.

Morgan used Drosophila as experimental material becauseA. It cannot be reared and bred under lab conditionsB. A single mating produce very few offspringsC. It has high number of morphologically similar chromosomesD. It has a short life span

Answer» Correct Answer - D
349.

The carrers of herdity material areA. ChromosomesB. GeneC. GametesD. Gametocycles

Answer» Correct Answer - A
(a) DNA is the hereditary material , which is located inside the chromosome .
350.

Loss of an X-chromosome in a particular cell, during its development, results intoA. diploid individualB. triploid individualC. gynandromorphsD. Both (a) and (b)

Answer» Correct Answer - C
Gynandromorphs are those individuals in which one part of the body is female while another part is male. It occurs due to the irregularity in mitosis at the first cleavage of the zygote. One of the X-chromosomes of an XX (female) zygote lags in the spindle, one daughter nucleus receives only one X-chromosomes. while the other receives two X-chromosomes. A mosaic body pattern is thus established which is known as gynandromorph.