Genetics worksheet with answers

Two Tt parents are crossed. T gives yellow seeds and is dominant over t, which gives green seeds. Click the cell for an offspring that has yellow seeds and is homozygous.

1. 1t × T
2. 2t × t
3. 3T × T
4. 4T × t

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?

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 a carrier daughter.

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

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?

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