The black colour coat in hamsters is due to a dominant gene (B). A recessive allele (b) at this locus results in a brown coat when homozygous. However, neither coat colour is expressed when the organism is homozygous for the allele (a) at a separate locus. The a/a genotype results in a white (albino) coat, regardless of the allele at the B locus. The wile type (+) at the (a) locus allows normal coat coloration, whether the genotype is +/+ or +/a.
A female hamster with the genotype B/B; +/+ is crossed with a male hamster of genotype b/b; a/a. Female offspring from the F1 generation were backcrossed with b/b; a/a parent. The distribution of coat coloration among the progeny is as follows: black (66), brown (34), and white (100).
Based on these results, what is the genetic map distance (frequency of recombination) between the two loci discussed in this passage?
Ans: 34 centimorgans
I don't really understand crossing over/linkage q's so if anyone could help, that'd be great.
A female hamster with the genotype B/B; +/+ is crossed with a male hamster of genotype b/b; a/a. Female offspring from the F1 generation were backcrossed with b/b; a/a parent. The distribution of coat coloration among the progeny is as follows: black (66), brown (34), and white (100).
Based on these results, what is the genetic map distance (frequency of recombination) between the two loci discussed in this passage?
Ans: 34 centimorgans
I don't really understand crossing over/linkage q's so if anyone could help, that'd be great.