Genetics worksheet with answers

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

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

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 tall, wrinkled 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?

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

In a population of 1000 in Hardy–Weinberg equilibrium, 1 in 2500 show a recessive trait. How many individuals N are expected to be homozygous dominant?