Chapter 5, Problem 25P

In rabbits, chocolate-colored fur $\left({\text{w}}^{\text{+}}\right)$ is dominant to white fur $\left(\text{w}\right)$, straight fur $\left({\text{c}}^{\text{+}}\right)$ is dominant to curly fur $\left(\text{c}\right)$, and long ear $\left({\text{s}}^{\text{+}}\right)$ is dominant to short ear $\left(\text{s}\right)$. The cross of a trihybrid rabbit with straight, chocolate-colored fur and long ears to a rabbit that has white, curly fur and short ears produce the following results:

$\begin{array}{cc}\text{<x-custom-btb-me data-me-id="2523" class="microExplainerHighlight">Phenotype</x-custom-btb-me>}& \text{Number}\\ \text{White, short, straight}& \text{13}\\ \text{Chocolate, long, straight}& \text{165}\\ \text{Chocolate, long, curly}& \text{13}\\ \text{White, long, straight}& \text{82}\\ \text{Chocolate, short, straight}& \text{436}\\ \text{Chocolate, short, curly}& \text{79}\\ \text{White, short, curly}& \text{162}\\ \text{White, long, curly}& \text{450}\\ & \text{1400}\end{array}$

a. Determine the order of the genes on the chromosome, and identify the alleles that are present on each of the homologous chromosomes in the trihybrid rabbits.

b. Calculate the recombination frequencies between each of the adjacent pairs of genes.

c. Determine the interference value for this cross.