Genetics worksheet with answers

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 is heterozygous (Aa)?

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 unaffected 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 tall plants (dominant) or short plants; gene B gives round seeds (dominant) or wrinkled seeds. Click the one cell for an offspring that is shows short plants 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 round seeds (dominant) or wrinkled seeds; gene B gives purple flowers (dominant) or white flowers. Click the one cell for an offspring that is homozygous for round seeds and 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