Drosophila female flies that are heterozygous for recessive alleles at three loci on chromosome 3 ("p" for pink eyes, "cp" for clipped wing margins, and "nb" for no bristles) are crossed to true-breeding pink-eyed, clipped-wing, no-bristle males. The distribution of phenotypes in the progeny was:
p + + 422
p + n b 51
+ + n b 26
p cp nb 1
p cp + 23
+ + + 1
+ cp + 47
+ cp nb 429
Calculate the genetic distance between the loci and draw the linkage map of the three genes.
What was the mother's genotype?