Genetics worksheet with answers

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

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

Two Rr parents are crossed. R gives round seeds and is dominant over r, which gives wrinkled seeds. Click the cell for an offspring that has round seeds and is homozygous.

1. 1r × r
2. 2r × R
3. 3R × r
4. 4R × R

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, round seeds?

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 purple flowers (dominant) or white flowers; gene B gives black fur (dominant) or white fur. Click the one cell for an offspring that is shows white flowers and is homozygous for black fur.

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 black fur (dominant) or white fur; gene B gives yellow seeds (dominant) or green seeds. Click the one cell for an offspring that is homozygous for black fur and shows 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