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 purple flowers and is dominant over a, which gives white flowers. Click the cell of the Punnett square for an offspring with white flowers.

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

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

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?

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

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 tall plants (dominant) or short plants. Click the one cell for an offspring that is shows white flowers and is homozygous for tall plants.

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