Genetics worksheet with answers

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

1. 1A × a
2. 2A × A
3. 3a × a
4. 4a × A

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 white flowers?

red-green colour blindness is X-linked recessive (allele b). A carrier mother, X^BX^b, has children with an affected father, X^bY. The mother's gametes run down the side. Click the cell for an affected son.

1. 1X^B × X^b
2. 2X^B × Y
3. 3X^b × X^b
4. 4X^b × Y

red-green colour blindness is X-linked recessive (allele b). A carrier mother, X^BX^b, has children with an unaffected father, X^BY. The mother's gametes run down the side. Click the cell for an affected son.

1. 1X^B × Y
2. 2X^B × X^B
3. 3X^b × Y
4. 4X^b × X^B

In a population of 10000 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 purple flowers (dominant) or white flowers; gene B gives tall plants (dominant) or short plants. Click the one cell for an offspring that is homozygous for purple flowers 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