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 has purple flowers?

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 has white flowers?

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?

haemophilia is X-linked recessive (allele h). A carrier mother, X^HX^h, has children with an affected father, X^hY. The mother's gametes run down the side. Click the cell for an affected son.

1. 1X^h × Y
2. 2X^h × X^h
3. 3X^H × Y
4. 4X^H × X^h

In a population of 2000 in Hardy–Weinberg equilibrium, 1 in 2500 show a recessive trait. How many individuals N are expected to be homozygous dominant?

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 white flowers and is homozygous for round 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