Genetics Worksheet (Page 2 of 2) in pdf

Genetics Worksheet Page 2

5. Wilma is believed to be heterozygous for her oval face shape, while Wilbur’s family

brags they are a purebred line for the oval face shape. Complete the Punnett square to

show the possibilities that would result if Wilma & Wilbur had children.

A. What is Wilma’s genotype? ________

B. What is Wilbur’s genotype? ________

C. Complete the Punnett square to show the possibilities

that would result if they had children.

D. List the possible genotypes & phenotypes of the children.

E. What is the probability of kids with oval face shape? ______%

F. What is the probability of kids with round face shape? ______%

6. Susan is so proud of her son and his new wife, Lisa, as they are expecting a baby!

Susan knows that they have a 50% chance of having a baby with a regular shaped chin,

but is hoping the new arrival will have a receding chin (a recessive trait) like Lisa and

many members of her family. If Shaun is heterozygous for his normal shaped chin,

what are the chances that the baby will have a receding chin? Create a Punnett square

to help you answer this question.

A. Lisa’s genotype is: ___________

B. Shaun’s genotype is: _________

C. What is the probability of a child with a

normal shaped chin? _____%

D. What is the probability of a child with a receding chin? _____%

7. Shaun’s aunt is famous around town for her itty bitty small eyes! She recently met a

cute fellow who also has small eyes, which is a recessive trait. Would it be possible for

them to have a child with large eyes? Why or why not? Create a Punnett square to

help you answer this question.

Genetics Worksheet Page 2