Name:Block:
a.
b.
Genetics Practice Problems 2
Date:
Must show all work (including Punnett squares) to get full credit for the following questions:
1. In summer squash, white fruit color (W) is dominant and yellow fruit color is recessive. A squash plant that is
homozygous for a white fruit color is crossed with a squash plant that is homozygous for yellow fruit color. Give
the phenotypic and genotypic ratios for the following:
the F₁ generation
the F2 generation
2. Brown eyes (B) are dominant over blue eyes. If a blue eyed, heterozygous widow peaked (W) male marries a
female with heterozygous brown and heterozygous widow peak, what is the phenotypic ratio of the possible
gametes? Show all work!
3. In garden peas, tallness (T) is dominant to shortness and axillary (A) flowers are dominant to terminal flowers.
What are the expected ratios for the phenotypes of the offspring if a heterozygous tall, heterozygous axillary plant
is crossed with a heterozygous tall, terminal plant?
4. Chicken feathers show codominance. A black chicken mates with a white chicken to form a speckled chicken.
What would a cross of two speckled chickens show? Give the cross as well as the genotype and phenotype ratios?
5. Some species of cows show incomplete dominance. A red cow mates with a white cow to form a roan cow. Roan
is a blend of red and white. Cross the following and give the genotype and phenotype ratio.
a. A red cow with a roan cow
6. A man with Type AB is having a child with a woman who is Type B. The woman had a parent who was Type O.
What possible blood types could their child have?
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