On one chromosome, the allele for white eyes is located at loci 12 and the allele for a hairy body is located at loci 16. On a second chromosome, the allele for red eyes is located at loci 15 and the allele for a normal body is located at loci 17. Which allele combination has the greater map distance?
A) white eyes and hairy body
B) white eyes and normal body
C) red eyes and normal body
D) red eyes and hairy body
E) white eyes and red eyes

Question

Quizplus · Accepted Answer

The map distance between alleles is determined by the physical distance between their loci on a chromosome. For white eyes (loci 12) and a hairy body (loci 16), the distance is 4 loci, which is greater than the distances between any other given pair of alleles.

On One Chromosome, the Allele for White Eyes Is Located