Genetics worksheet with answers

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

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

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

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

haemophilia is X-linked recessive (allele h). A carrier mother, X^HX^h, has children with an affected father, X^hY. The mother's gametes run down the side. Click the cell for an unaffected son.

1. 1X^H × Y
2. 2X^H × X^h
3. 3X^h × Y
4. 4X^h × X^h

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 4% of a population in Hardy–Weinberg equilibrium. What fraction f of the population are carriers (heterozygous)?

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