Genetics worksheet with answers

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

1. 1r × r
2. 2r × R
3. 3R × r
4. 4R × R

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

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

red-green colour blindness is X-linked recessive (allele b). A carrier mother, X^BX^b, has children with an unaffected father, X^BY. The mother's gametes run down the side. Click the cell for an affected son.

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

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 short, wrinkled seeds?

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 both short plants and 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 yellow seeds (dominant) or green seeds; gene B gives purple flowers (dominant) or white flowers. Click the one cell for an offspring that is shows green seeds and is homozygous 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