Question

4) You performed matings with other flies from question 3 and found some unusual results. The 1600 F2 progeny are the result of crossing the F1 progeny to each other.

P1: thick wings, white bristles, long antenna female x skinny wings, red bristles, aba male

F1: all thick wings, red bristles, long antenna flies

F2:       910 thick wings, red bristles, long antenna flies

290 skinny wings, red bristles, aba flies

            110 skinny wings, white bristles, aba flies

            280 thick wings, white bristles, long antenna flies

                3 thick wings, red bristles, aba flies

                4 skinny wings, red bristles, long antenna flies

                1 thick wings, white bristles, aba flies

                2 skinny wings, white bristles, long antenna flies

A. What is the inheritance pattern of the traits?

B. Which, if any, of the genes are linked? What are the map distances between the linked genes?

Please answer A and B and explain how you got to the answer. Thank you!

Answer 1

The parental characters in the F₂ genaration are 910 and the remaining are in low ratio of recombinants.

Thick wings and long antenna are linked genes. And aba flies had only white bristle. so they are also linked genes.

The percentage of thick wings, red bristles and long antenna is 910/1590x100=57

the percentage of skinny wings, red bristles and aba flies is 18

The percantage of shinny wings, white bristles and aba flies is 17

The percentage of thich wings, white bristles and long antenna is 7