Irregularity is found in drosophila during organ differentiation for example- in place of the wing, long legs are formed. Which gene is responsible for it:

1. Double dominant gene

2. Homeotic gene

3. Complimentary gene

4. Plastid

The linkage map of the X-chromosome of fruitfly has 66 units, with yellow body gene (y) at one end and bobbed hair (b) gene at the other end. The recombination frequency between these two genes (y and b) should be:

1. 60%

2. > 50%

3. ≤ 50%

4. 100%

A genetic map is one that:

1. Establishes sites of the genes on a chromosome

2. Establishes the various stages in gene evolution

3. Shows the stages during the cell division

4. Shows the distribution of various species in a region

The salivary gland chromosomes in the dipteran larva, are useful in gene mapping because: