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 purple flowers?

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 unaffected son.

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

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

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

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

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