Monohybrid Worksheet Name:________________________________ Date:________________ Genetic Problems: genotypes, gametes, and monohybrid crosses

1. What type of gametes would be produced by organisms having the following genotypes? (a) Aa (b) AA (c) aa (d) AaBb (e) AABb 2. In garden peas, tall vine (T) is dominant and short vine (t) is recessive.

a. If a homozygous tall pea plant is crossed with a homozygous short pea plant, what genotypes are possible in a F1 generation?

b. If a heterozygous tall pea plant is crossed with a short pea plant, what genotypes and phenotypes are possible in the F1 generation?

3. In summer squash, white fruit color (W) is dominant and yellow fruit color (w) 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. Predict the appearance of: (a) the F1 generation; (b) the F2 generation and (c) the offspring of a cross between an F1 individual and a homozygous white individual?

4. In laboratory mice, the normal gray (G) color is dominant over the white albino (g) color.

a. If a purebred albino mouse and a purebred gray mouse were mated, what is predicted ratio of phenotypes in the F1 generation?

b. What is the predicted ratio of phenotypes in the F2 generation?

5. A brown mouse is crossed with a heterozygous black mouse. If the mother has a litter of four, what are the chances that all four of them will be brown?

6. Dice have 6 sides.

a. What is the probability that an even number will come up on one throw of the die? b. What is the probability that an even number will come on both dice if two dice are

rolled at the same time?

7. The Jones family has eight children, all of those whom are girls. What is the chance that the next child will be a boy? Explain how you determine your answer.