Genetics worksheet with answers

Two Bb parents are crossed. B gives yellow seeds and is dominant over b, which gives green seeds. Click the cell of the Punnett square for an offspring with green seeds.

1. 1b × b
2. 2b × B
3. 3B × b
4. 4B × B

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?

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, wrinkled seeds?

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

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