Genetics worksheet with answers

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

1. 1A × a
2. 2A × A
3. 3a × a
4. 4a × A

Two Bb parents are crossed. B gives black fur and is dominant over b, which gives white fur. Click the cell for an offspring that has black fur and is homozygous.

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

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, 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, round 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 green seeds and is homozygous 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

A recessive condition affects 1% of a population in Hardy–Weinberg equilibrium. What fraction f of the population are carriers (heterozygous)?