Genetics worksheet with answers

In pea plants, purple flowers (A) are dominant over white (a). A plant with genotype Aa is crossed with a plant with genotype AA. What is the probability P that an offspring is heterozygous (Aa)?

Two Tt parents are crossed. T gives black fur and is dominant over t, which gives white fur. Click the cell for an offspring that has black fur and is homozygous.

1. 1t × T
2. 2t × t
3. 3T × T
4. 4T × t

Tall (A) is dominant over short (a), and round seeds (B) over wrinkled (b). The genes are on different chromosomes. For the cross AaBb × aaBb, what is the probability P that an offspring is short, wrinkled seeds?

Tall (A) is dominant over short (a), and round seeds (B) over wrinkled (b). The genes are on different chromosomes. For the cross AaBb × AaBb, what is the probability P that an offspring is tall, wrinkled seeds?

Two AaBb parents are crossed. Gene A gives yellow seeds (dominant) or green seeds; gene B gives black fur (dominant) or white fur. Click the one cell for an offspring that is shows green seeds and is homozygous for black fur.

1. 1aB × aB
2. 2aB × ab
3. 3aB × AB
4. 4aB × Ab
5. 5ab × aB
6. 6ab × ab
7. 7ab × AB
8. 8ab × Ab
9. 9Ab × aB
10. 10Ab × ab
11. 11Ab × AB
12. 12Ab × Ab
13. 13AB × aB
14. 14AB × ab
15. 15AB × AB
16. 16AB × Ab

A recessive condition affects 9% of a population in Hardy–Weinberg equilibrium. What fraction f of the population are carriers (heterozygous)?