1. Crossing over takes place in the

2. There are 4 pairs of chromosomes in a Drosophila The linkage groups present in it are

3. Percentage of crossing over is more when

4. If the percentage of crossing over between two genes is 10, then the distance between two genes will be

5. Alleles of different genes that are on the same chromosome can occasionally be separated by a phenomenon called

6. Repulsion and coupling are two faces of

7. If gene frequency between genes a and c is 2%; b and c is 13%; b and d 4%; a and b 15%; c and d 17 and a and d 19% The sequence of genes in a chromosome is

8. This is the reason why Mendel did not recognize linkage phenomenon in his experiments

9. In a linear chromosome map distance between 4 loci is as follows a-b is 10%, a-d is 3%, b-c is 4% and a-c is 6% The crossover frequency between c and d is

10. Where does this evidence come from? – crossing over takes place at a four-stranded stage and not at two stranded stages of chromosomes

11. Crossing over occurs between