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 Rr parents are crossed. R gives round seeds and is dominant over r, which gives wrinkled seeds. Click the cell of the Punnett square for an offspring with wrinkled seeds.

1. 1r × R
2. 2r × r
3. 3R × R
4. 4R × r

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, 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?

In a population of 1000 in Hardy–Weinberg equilibrium, 4% show a recessive trait. How many individuals N are expected to be homozygous dominant?

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