Question

3 complex inheritance
in horses, coat color is a codominant trait. colored coat horses (ww) and white coat horses (tt) can produce roan coat horses (wt). cross a roan coat horse with a colored coat horse.
what is the phenotypic ratio of this cross?

Explanation:

Step1: Identify parent genotypes

Parents: Roan (WT) and Colored (WW)

Step2: Set up Punnett square

$$\begin{array}{c|cc} & W & T \\ \hline W & WW & WT \\ W & WW & WT \\ \end{array}$$

Step3: Count phenotypes

WW = Colored coat (2 offspring), WT = Roan coat (2 offspring)

Step4: Simplify phenotypic ratio

$\frac{2}{4} = \frac{1}{2}$ for each phenotype, so ratio is 1:1

Answer:

1 Colored coat horse : 1 Roan coat horse (or 1:1)