Genetics worksheet with answers

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

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

In pea plants, purple flowers (A) are dominant over white (a). A plant with genotype Aa is crossed with a plant with genotype Aa. What is the probability P that an offspring has purple flowers?

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?

In a population of 2000 in Hardy–Weinberg equilibrium, 9% show a recessive trait. How many individuals N are expected to be homozygous dominant?

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

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