In chickens, the genes for comb shape and feather color are located approximately 14 centimorgans (cM) apart on the same chromosome. This means that 14% of the time recombination occurs between them during meiosis, and 86% of the time the alleles on the same chromosome are inherited together. Rose comb (RR or Rr) is dominant to single comb (rr) and white feathers (WW or Ww) are dominant to colored feathers (ww).
White, Single Comb (W_, rr)
Colored, Single Comb (ww, rr)
White, Rose Comb (W_, R_)
Colored, Rose Comb (ww, R_)
6. What terms describes the genetic action happening between the white/colored locus and the rose/single comb locus?
7. If a rooster with a single comb and colored feathers (Rooster A) mates with a chicken that has a rose comb and white feathers (Chicken M), what are the expected genotype and phenotype proportions of their offspring?
a. Chicken M was sired by a rooster with a rose comb and white feathers and out of a chicken with a single comb and color feathers.