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 purple flowers and is dominant over r, which gives white flowers. Click the cell for an offspring that has purple flowers and is homozygous.

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 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 short, round seeds?

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

In a population of 5000 in Hardy–Weinberg equilibrium, 9% show a recessive trait. How many individuals N are expected to be homozygous dominant?