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 Bb parents are crossed. B gives purple flowers and is dominant over b, which gives white flowers. Click the cell for an offspring that has purple flowers and is homozygous.

1. 1B × B
2. 2B × b
3. 3b × B
4. 4b × b

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, round 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 short, wrinkled seeds?

Two AaBb parents are crossed. Gene A gives purple flowers (dominant) or white flowers; gene B gives round seeds (dominant) or wrinkled seeds. Click the one cell for an offspring that is shows both white flowers and wrinkled seeds.

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

In a population of 500 in Hardy–Weinberg equilibrium, 1 in 400 show a recessive trait. How many individuals N are expected to be homozygous dominant?