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?

Two Aa parents are crossed. A gives tall plants and is dominant over a, which gives short plants. Click the cell of the Punnett square for an offspring with short plants.

1. 1A × a
2. 2A × A
3. 3a × a
4. 4a × A

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 unaffected father, X^DY. The mother's gametes run down the side. Click the cell for an affected son.

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

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 homozygous for purple flowers and 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

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