A population of caterpillars has three mutations; pink ( p ) instead of blue, sp

Question

A population of caterpillars has three mutations; pink (p) instead of blue, sparkly (r) instead of dull coats, and smelly (l) instead of odorless secretions. You cross triply heterozygous adult females with triply homozygous recessive adult males. The progeny are as follows:

278      Pink, dull, odorless

53        Blue, sparkly, odorless

305      Blue, sparkly, smelly

8          Pink, sparkly, odorless

57        Pink, sparkly, smelly

6          Blue, dull, smelly

63        Blue, dull, odorless

60        Pink, dull, smelly

a. What were the parental genotypes?

b. Calculate the distances between the genes of interest.

p to r

r to l

l to p

c. Draw the genetic map, including the distances between the genes.

Explanation / Answer

a.Frequently occurring progeny indicates the parental genotypes. So, Blue, sparkly, smelly (Prl) and pink, dull, odorless (pRL) are parental genotypes.

b. p to r is 31.4 cM, r to l is 16.1 cM, l to p is 16.5 cM

c. p----15.3-------l------16.1---------r

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