Question

1. patrick met patti at the dance. both of them are heterozygous for their pink body color (p), which is dominant over a yellow color (p). fill in the punnett square to show the possible genotypes if patrick and patti had offspring.

a. list the genotypes with the phenotypes of the possible offspring.
b. what are the chances of a child with a pink body? out of or what percent?
c. what are the chances of a child with a yellow body? out of or what percent?

Explanation:

Step1: Set up Punnett Square

Both parents are heterozygous: $Pp \times Pp$. The gametes for each are $P$ and $p$.

$$\begin{array}{c|cc} & P & p \\ \hline P & PP & Pp \\ p & Pp & pp \\ \end{array}$$

Step2: Link genotypes to phenotypes

Dominant $P$ gives pink body; recessive $pp$ gives yellow.

• $PP$: Pink body
• $Pp$: Pink body
• $pp$: Yellow body

Step3: Calculate pink offspring chance

Count pink genotypes: 3 out of 4. Convert to percent: $\frac{3}{4} \times 100 = 75\%$

Step4: Calculate yellow offspring chance

Count yellow genotype: 1 out of 4. Convert to percent: $\frac{1}{4} \times 100 = 25\%$

Answer:

Punnett Square:

$$\begin{array}{c|cc} & P & p \\ \hline P & PP & Pp \\ p & Pp & pp \\ \end{array}$$

a. Genotypes and Phenotypes:

• $PP$: Pink body
• $Pp$: Pink body
• $pp$: Yellow body

b. Pink body chance:

3 out of 4, or 75%

c. Yellow body chance:

1 out of 4, or 25%