Heredity

Test Description: Draw out Punnett squares on a piece of paper to help you solve the problems.

Instructions: Answer all questions to get your test result.

1) In humans, brown eyes (B) are dominant to blue eyes (b). Your parents both have brown eyes, and both are heterozygous (Bb). What percentage of their offspring are likely to have brown eyes?

2) In humans, brown eyes (B) are dominant to blue eyes (b). Your parents both have brown eyes, and both are heterozygous. What is dad’s genotype?

3) A widow’s peak is a dominant trait (W) over no widow’s peak (w). Mr. Trainer’s genotype is homozygous dominant (WW), and Mrs. Trainer is homozygous recessive (ww). What percentage of their offspring will be homozygous dominant (WW)?

4) The ability to roll your tongue is dominant over not being able to roll your tongue. If you cannot roll your tongue, what is your genotype?

5) Attached earlobes are a dominant trait (E) over detached earlobes (e). If a mom is homozygous recessive for earlobes, and the dad is heterozygous, what percentage of their children are likely to have attached earlobes?

6) Fluffy fur is a dominant trait in guinea pigs. Two fluffy guinea pigs have a non-fluffy offspring. What must be the genotypes of the parents?

7) Cuteness is a dominant trait in bunnies. Two bunnies who are heterozygous for cuteness have numerous offspring. What percentage of their offspring would be predicted to not be cute?

8) The dominant allele (R) codes for rainbow colored horns, and the recessive allele (r) codes for white horns. What percentage of offspring would have white horns from the cross of a homozygous dominant and a heterozygous unicorn?

9) In purple people eaters, one tongue is dominant and two tongues is recessive. If you crossed a hybrid with one with two tongues, what percentage of the offspring are expected to have two tongues?

10) In human blood type, O is recessive, and both A and B are dominant. If the father has O blood type, and the mother has A blood type with a genotype of AA, what percent of their children will have A blood type?


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