Q. No.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 |
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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 number of types of gametes produced by a plant with the genotype AaBbCCDd will be:
| 1. | 2 | 2. | 4 |
| 3. | 8 | 4. | 16 |
The mode of inheritance of the trait shown in the given pedigree is MOST likely:
| 1. | X-linked recessive | 2. | Autosomal recessive |
| 3. | X-linked dominant | 4. | Autosomal dominant |
Assuming independent assortment, the percent of progeny with genotype AABb from a cross AaBb X AaBb is expected to be:
| 1. | 7.5 | 2. | 15 |
| 3. | 12.5 | 4. | 30 |
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The mode of inheritance of the trait shown in the following pedigree is most likely:
| 1. | Autosomal recessive | 2. | Sex-linked recessive |
| 3. | Autosomal dominant | 4. | Sex-linked dominant |
An F2 phenotypic ratio of 1: 4: 6: 4: 1 from a cross AaBb X AaBb is expected in the case of:
| 1. | Dominant epistasis | 2. | Complementary genes |
| 3. | Polygenic inheritance | 4. | Independent assortment |
A dihybrid test cross results in a recombination frequency of 50%. Most likely the two genes under consideration:
| 1. | are closely linked on the same autosome |
| 2. | are located on heterologous chromosomes |
| 3. | are present on the X chromosome |
| 4. | are located on the same chromosome, one on either side of the centromere |
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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