Genetics worksheet with answers

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

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

Two Bb parents are crossed. B gives black fur and is dominant over b, which gives white fur. Click the cell of the Punnett square for an offspring with white fur.

1. 1B × B
2. 2B × b
3. 3b × B
4. 4b × b

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 unaffected son.

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, wrinkled seeds?

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