Genetics worksheet with answers

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

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

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?

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 a carrier daughter.

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

Two AaBb parents are crossed. Gene A gives round seeds (dominant) or wrinkled seeds; gene B gives black fur (dominant) or white fur. Click the one cell for an offspring that is shows wrinkled seeds 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 tall plants (dominant) or short plants; gene B gives black fur (dominant) or white fur. Click the one cell for an offspring that is homozygous for tall plants 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