Question

In guinea pigs, dark hair (D) is dominant over light hair (d) and curly hair (C) is dominant over smooth hair (c). Complete a dihybrid cross for parents with the genotypes: DdCc × DdCc and answer the following in complete sentences. 1. Describe how you would set up a Punnett square for this cross. 2. List the likelihood of each possible offspring genotype. 3. List the likelihood of each possible offspring phenotype.

Answer 1

P: DdCc x DdCc
g: DC Dc dC dc DC Dc dC dc

1.)

DC Dc dC dc

DC DDCC DDCc DdCC DdCc
Dc DDCc DDcc DdCc Ddcc
dC DdCC DdCc ddCC ddCc
dc DdCc Ddcc ddCc ddcc

2.)

G= 1:2:2:1:1:4:2:2:1

3.)

F= 9:3:3:1