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 has purple flowers?

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?

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?

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 unaffected son.

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

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