Genetics Worksheet (Page 6 of 8) in pdf

Genetics Worksheet Page 6

10. Coat color in cats is a codominant trait and is also located on the X chromosome. Cats can be black,

yellow or calico. A calico cat has black and yellow splotches.

a. When a female calico cat is mated with a male black cat, what are the phenotypes of the

offspring?

b. Where any of the offspring calico? ________ If so, what gender was it? ____________

11. A girl inherited colorblindness, which is a sex-linked recessive trait. It is probable, therefore, that __.

a. Both parents had one colorblindness gene.

b. Only one parent had the colorblindness gene.

c. The gene in the mother guaranteed the girl having the disease.

d. The father did not have the recessive gene.

12. A colorblind man marries a woman who is neither colorblind nor a carrier of the trait. Which statement

best describes their probable offspring?

a. All the boys will be colorblind.

c. All the girls will be carriers but not have the disease.

b. All the girls will be colorblind.

d. Half the boys will carry the gene for colorblindness.

Multiple Alleles –

13. In the ABO blood type system, the A and B are codominant and the o allele is recessive. A man with

type AB blood marries a woman with type AB blood. If they have children, what are the possible

phenotypes?

_______ A blood

_______ B blood

_______ AB blood

_______ o blood

14. A man with type AB blood is married to a woman with type o blood. They have two natural children and

one adopted child. Jane has type A blood, Bobby has type B blood and Grace has type o blood. Which

child was adopted? ____________

15. A nurse at a hospital removed the wrist tags of three babies in the maternity ward. She needs to figure

out which baby belongs to which parents, so she checks their blood types. Using the chart below,

match the baby to its correct parents. Show the crosses to prove your choices.

Parents

Blood Types

Baby

Blood type

Mr. Frisbee

Mrs. Frisbee

Dominic

Mr. Zimmerman

Kristen

Mrs. Zimmerman

Tommy

Mr. Law

Mrs. Law

Genetics Worksheet Page 6