Question

Will Fan and Medal!

In Drosophila, normal wing shape is dominant to dumpy wings, and gray body is dominant to yellow. A fly homozygous for both dominant traits was crossed with a fly homozygous for both recessive traits. The F1 progeny were testcrossed. In the F2 generation there were 80 normal wing, gray body; 81 dumpy wing, yellow body; 19 normal wing, yellow body; 21 dumpy wing, gray body. These data indicate that the genes are:

Answer 1

a. on different chromosomes.
b. linked but do not crossover.
c. linked with a genetic distance of 10%.
d. linked with a genetic distance of 20%.
e. linked with a genetic distance of 40%.

Answer 2

i'd say E

Answer 3

And why?..

Answer 4

'cause normal wing shape is dominant to dumpy wings - but in the F2 generation there were 80 normal wing, gray body

Answer 5

and 'cause a gray body is dominant to yellow - but 81 dumpy wing, yellow body

Answer 6

these are the only "correct" statistics: 19 normal wing, yellow body; 21 dumpy wing, gray body

Answer 7

thus its like 20% or something

Answer 8

but 20 is too low so its gotta be 40 which is highest

Answer 9

lol..... Genetic linkage in % means how many centiomorgans they are apart form each other... So you aren't making sense at all.