Genetics worksheet with answers

Two Bb parents are crossed. B gives round seeds and is dominant over b, which gives wrinkled seeds. Click the cell for an offspring that has round seeds and is homozygous.

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

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

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

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?

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 × 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 homozygous for tall plants and shows wrinkled 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 black fur (dominant) or white fur; gene B gives tall plants (dominant) or short plants. Click the one cell for an offspring that is homozygous for black fur 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