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 is heterozygous (Aa)?

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?

Duchenne muscular dystrophy is X-linked recessive (allele d). A carrier mother, X^DX^d, has children with an affected father, X^dY. The mother's gametes run down the side. Click the cell for an affected daughter.

1. 1X^D × Y
2. 2X^D × X^d
3. 3X^d × Y
4. 4X^d × X^d

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 both white fur and green 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 10000 in Hardy–Weinberg equilibrium, 1 in 2500 show a recessive trait. How many individuals N are expected to be homozygous dominant?