KEY MCAS Genetics Open Response

A man and a woman plan to have a biological child. They want to determine the likelihood that their child will inherit a genetic condition that runs in both of their families. One gene with two alleles is responsible for the condition. The dominant allele (A) produces the normal phenotype, and the recessive allele (a) produces the genetic condition. Both the man and the woman have the normal phenotype.

2

Using the allele symbols A and a, identify all possible genotypes of a normal man and all possible genotypes of a normal woman for this genetic condition.

8

Complete the Punnett square to show how the man and the woman can have a biological child with this genetic condition.

Drag and drop an allele or allele pair into each box. Each allele or allele pair may be used once, more than once, or not at all.

Identify the percentage of offspring that are expected to have the genetic condition based on the Punnett Square in question 2.

5

After doing some research, they determine the genetic condition is X-linked.

Drag and drop allele pairs into the boxes to identify all possible genotypes of the man and all possible genotypes of the woman. Each allele pair may be used once, more than once, or not at all.

XaY
XAXa
XAXA
XaXa
XAY

Man
Woman

Complete the Punnett square with the parental genotypes identified in question 4 that could produce a child with this X linked genetic condition.

Remember both parents have a normal phenotype. 
The dominant allele (A) produces a normal phenotype and the recessive allele (a) produces the genetic condition.

4

Complete the Punnett square to show how the man and the woman can have a biological child with this genetic condition.

1

Using the allele symbols A and a, identify all possible genotypes of a normal man and all possible genotypes of a normal woman for this genetic condition.

Identify the percentage of offspring that are expected to have the genetic condition based on the Punnett Square in question 2.

After doing some research, they determine the genetic condition is X-linked.Drag and drop allele pairs into the boxes to identify all possible genotypes of the man and all possible genotypes of the woman. Each allele pair may be used once, more than once, or not at all.

Complete the Punnett square to show how the man and the woman can have a biological child with this genetic condition.

Identify the percentage of males that are expected to have the genetic condition based on this Punnett square.

After doing some research, they determine the genetic condition is X-linked.

Drag and drop allele pairs into the boxes to identify all possible genotypes of the man and all possible genotypes of the woman. Each allele pair may be used once, more than once, or not at all.