Q. No.A pleiotropic gene:
1.
Is expressed only in primitive plants
2.
Is a gene that evolved during Pliocene
3.
Controls a trait only in combination with another gene
4.
Controls multiple traits in an individual
The movement of a gene from one linkage group to another is called:
2. duplication
3. translocation
4. crossing over
Fruit colour in squash is an example of:
1. Recessive epistasis
2. Dominant epistasis
3. Complementary genes
4. Inhibitory genes
| 1. | 50% | 2. | 25 % |
| 3. | 100% | 4. | no chance |
A man whose father was colour blind marries a woman who had a colour blind mother and a normal father. What percentage of male children of this couple will be colour blind?
1. 25%
2. 0%
3. 50%
4. 75%
| 1. | XO type of sex chromosomes determines male sex in grasshopper |
| 2. | XO condition in humans as found in Turner syndrome, determines female sex |
| 3. | Homozygous sex chromosomes (XX) produce males in Drosophila |
| 4. | Homozygous sex chromosomes (ZZ) determine the female sex in birds. |
Sickle cell anaemia is:
| 1. | an autosomal linked dominant trait |
| 2. | caused by substitution of valine by glutamic acid in the globin chain of haemoglobin |
| 3. | caused by a change in base pair of DNA |
| 4. | characterized by elongated sickle like RBCs with a nucleus |
In hexaploid wheat, the haploid (n) ar basic (x) numbers of chromosomes are:
1. n=7 and x=21
2. n=21 and x=21
3. n=21 and x=14
4. n=21 and x=7
Inheritance of skin colour in humans is an example of:
1. chromosomal aberration
2. point mutation
3. polygenic inheritance
4. codominance
Two genes R and Y are located very close on the chromosomal linkage map of the maize plant. When RRYY and rryy genotypes are hybridized, then F2 segregation will show:
1. higher number of the recombinant types
2. segregation in the expected 9:3:3:1 ratio
3. segregation in a 3:1 ratio
4. higher number of the parental types
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