You are mapping the location of two genes in Drosophila, listless l and blind b. (l+ l+ b+ b+) and (l+ l b+ b) flies are normal, but (l l b b) flies don't move around very much and cannot detect the location of a light source. You perform a testcross with a doubly heterozygous fruit fly and get the following results:listless, sighted: 100
listless, blind: 400
normal activity, sighted 400
normal activity, blind 100
What is the distance between these two genes?
A. They are 10 map units apart.
B. They are 40 map units apart.
C. They are on different chromosomes.
D. They are 80 map units apart.
E. They are 20 map units apart.
Answer: E
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