Question

a species of moth comes in two basic colors: brown and white. examine the model below and use the punnett square you just made to help you. predict what percentage of offspring will be brown if the middle moth and the bottom moth mate. genotype phenotype aa dark aa dark aa light

Explanation:

Step1: Identify parent genotypes

Middle moth: $Aa$, Bottom moth: $aa$

Step2: Set up Punnett square

	$A$	$a$
$a$	$Aa$	$aa$

Step3: Count brown offspring genotypes

Brown (dark) phenotype corresponds to $AA$ or $Aa$. From the square, 2 out of 4 offspring are $Aa$.

Step4: Calculate percentage

$\text{Percentage} = \frac{2}{4} \times 100\% = 50\%$

Answer:

50%