Genetics worksheet with answers

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

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?

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

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

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

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

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

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