Genetics worksheet with answers

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

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

Two Bb parents are crossed. B gives tall plants and is dominant over b, which gives short plants. Click the cell for an offspring that has tall plants 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 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 tall, round seeds?

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

In a population of 2000 in Hardy–Weinberg equilibrium, 1% show a recessive trait. How many individuals N are expected to be homozygous dominant?