Name ________________________ pd _____________

Lactose is a sugar found in milk.The recessive allele cause lactose intolerance

The dominant allele for the digestion of lactose = EThe recessive allele for lactose intolerance = e

A man who is heterozygous for lactose digestion has children with a woman who has lactose intolerance.

1) Complete the Punnett Square below to show the predicted outcome of the offspring. (4 pts.)

GenotypesDad = ______

Mom = ______

2) What is chance one of their children will have lactose intolerance. (1 pt.)

____________%

3) The couple had six children, but only one of the six was lactose intolerance. Explain how it is possible that only one child has lactose intolerance. Use complete sentences to answer. (3 pts.)

Explanation:

______________________________________________________

______________________________________________________

______________________________________________________

______________________________________________________

E e

e

e

Name ________________________ pd _____________

Lactose is a sugar found in milk.The recessive allele cause lactose intolerance

The dominant allele for the digestion of lactose = EThe recessive allele for lactose intolerance = e

A man who is heterozygous for lactose digestion has children with a woman who has lactose intolerance.

1) Complete the Punnett Square below to show the predicted outcome of the offspring. (4 pts.)

GenotypesDad = ______

Mom = ______

2) What is chance one of their children will have lactose intolerance. (1 pt.)

____________%

3) The couple had six children, but only one of the six was lactose intolerance. Explain how it is possible that only one child has lactose intolerance. Use complete sentences to answer. (3 pts.)

Explanation:

______________________________________________________

______________________________________________________

______________________________________________________

______________________________________________________

E e

e

e