Q. No.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
If Mendel might have studied 7 pairs of characters in a plant with 12 chromosomes instead of 14 then:
| 1. | He could not discover an independent assortment |
| 2. | He might have discovered linkage |
| 3. | He might have discovered crossing over |
| 4. | He might have not observed dominance |
A gene is said to be dominant if:
| 1. | It expresses its effect only in the homozygous stage |
| 2. | It expresses only in heterozygous condition |
| 3. | It expresses both in homozygous and heterozygous conditions |
| 4. | It is never expressed in any condition |
1. Klinefelter's syndrome
2. Turner’s syndrome
3. Oculocutaneous albinism
4. Down’s syndrome
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% |
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 |
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 % | 2. | 25 % |
| 3. | 15 % | 4. | 30 % |
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 number of types of gametes produced by a plant with the genotype AaBbCCDd will be:
| 1. | 2 | 2. | 4 |
| 3. | 8 | 4. | 16 |
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