Genetics worksheet with answers

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

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

Two Rr parents are crossed. R gives tall plants and is dominant over r, which gives short plants. Click the cell for an offspring that has tall plants 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?

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

Two AaBb parents are crossed. Gene A gives tall plants (dominant) or short plants; gene B gives purple flowers (dominant) or white flowers. Click the one cell for an offspring that is shows short plants and is homozygous for purple flowers.

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