Q. No.Drosophila melanogaster is a model organism for the study of genetics. The advantages of this organism include all the following except:
1.
A long life cycle
2.
A large number of progeny produced by a single mating
3.
Clear differentiation between sexes
4.
Hereditary variation is easily seen with low-power microscopes
The progeny of a dihybrid test cross AaBb x aabb show the following genotypes: AaBb 160, Aabb 460, aaBb 440, aabb 140. The recombination frequency between the two loci is:
| 1. | 12.5 % | 25 % | |
| 3. | 15 % | 4. | 30 % |
The physiological basis of pleiotropy is:
| 1. | lack of independent assortment in linked genes |
| 2. | separation of homologous chromosomes at anaphase I in meiosis I |
| 3. | dominance is not an autonomous feature of an allele |
| 4. | inter-relationships of many metabolic pathways in the living organisms |
A human female who is not color blind but whose father was color blind marries a normal male. What proportion of their male progeny will have red-green color blindness?
| 1. | 75% | 2. | 50% |
| 3. | 25% | 4. | 0% |
Gynecomastia is an important clinical feature seen in individuals with:
| 1. | Klinefelter's syndrome | 2. | Turner’s syndrome |
| 3. | Oculocutaneous albinism | 4. | Down’s syndrome |
The number of types of gametes produced by a plant with the genotype AaBbCCDd will be:
| 1. | 2 | 2. | 4 |
| 3. | 8 | 4. | 16 |
The father and the mother of a child, with blood group O, have the blood groups A and B respectively. If these parents then have non-identical twins, what is the probability that both twins will have blood group B?
| 1. | ¼ | 2. | 1/8 |
| 3. | ¾ | 4. | 1/16 |
Assuming independent assortment, the ratio of progeny with the genotypes AaBb : Aabb : aaBb : aabb from a dihybrid cross AabB X AaBb will respectively be:
| 1. | 4 : 3 : 2 : 1 | 2. | 4 : 4 : 2 : 1 |
| 3. | 4 : 2 : 2 : 1 | 4. | 4 : 2 : 1 : 1 |
Which of the following is a recessive trait in Pisum sativum?
| 1. | Yellow pod color | 2. | Axial flower position |
| 3. | Inflated pod shape | 4. | Violet flower color |
A trait displays continuous phenotypic variation and is spread across a gradient. Usually, the inheritance of this trait can be described as:
1. dominant-recessive inheritance
2. multiple-allele inheritance
3. polygenic inheritance
4. sex-linked inheritance
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