Question

How do you tell if a gene has changed linkage?

Answer 1

What do mean by changed linkage, can you be more specific, I kinndda didnt get that

Answer 2

so the problem is
In Drosophila the genes A B D are linked. You cross a strain that is homozygous for d
with a strain that is homozygous for ab. Below are the phenotypes and progeny of a test
cross. Outline the cross and determine the map for the genes. Calculate the coefficient of
coincidence and the interference.

Phenotype Number
ABd 389
abD 413
ABD 60
abd 68
aBd 29
AbD 34
Abd 3
aBD 4

Answer 3

and then the answer says
In the double XO's (the last two rows), B is the gene that has changed linkage. Therefore, the sequence is --
A---B---D--

Answer 4

And I don't know why B is the gene that changed linkage.

Answer 5

because the sequences of the b's are Bb, Bb,Bb, but then for the last 2 it goes bB. you have to look for the pattern it then. genetics is a patterns.

Answer 6

ok thank you!

Answer 7

your welcome