In mice, the allele for normal pigmented fur (AAA) is dominant over the allele for albino (white) fur (aaa).
A researcher crossed a homozygous normal-pigmented mouse (genotype AAAAAA) with a homozygous albino mouse. All resulting F1F_1F1 offspring had normal-pigmented fur.
State the genotype of the homozygous albino parent mouse.
Two of the F1F_1F1 offspring mice (both with genotype AaAaAa) are crossed. Complete the genetic diagram (Punnett square) below by determining the missing genotypes of the offspring.
Male gamete: AMale gamete: aFemale gamete: AAA(i)Female gamete: a(ii)(iii)\begin{array}{c|c|c} & \text{Male gamete: } A & \text{Male gamete: } a \\\hline \text{Female gamete: } A & AA & \text{(i)} \\\hline \text{Female gamete: } a & \text{(ii)} & \text{(iii)} \end{array}Female gamete: AFemale gamete: aMale gamete: AAA(ii)Male gamete: a(i)(iii)
Identify the genotypes for (i), (ii), and (iii).
State the expected ratio of normal-pigmented mice to albino mice in the offspring of this cross in its simplest form.