Genetics worksheet with answers

Free printable Genetics worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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1.Easy
♂ Rr♀ RrrRrR

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

Rr × Rr
  1. 1r × r
  2. 2r × R
  3. 3R × r
  4. 4R × R
2.Easy
♂ Aa♀ AaAaaA

Two Aa parents are crossed. A gives black fur and is dominant over a, which gives white fur. Click the cell of the Punnett square for an offspring with white fur.

Aa × Aa
  1. 1a × A
  2. 2a × a
  3. 3A × A
  4. 4A × a
3.Medium
♂♀XD​YXd​XD​

Duchenne muscular dystrophy is X-linked recessive (allele d). A carrier mother, XDXd, has children with an unaffected father, XDY. The mother's gametes run down the side. Click the cell for an unaffected son.

♀ XDXd♂ XDY
  1. 1Xd × XD
  2. 2Xd × Y
  3. 3XD × XD
  4. 4XD × Y
4.Medium
♂♀YXH​XH​Xh​

haemophilia is X-linked recessive (allele h). A carrier mother, XHXh, has children with an unaffected father, XHY. The mother's gametes run down the side. Click the cell for an affected son.

♀ XHXh♂ XHY
  1. 1XH × Y
  2. 2XH × XH
  3. 3Xh × Y
  4. 4Xh × XH
5.Hard
♂ AaBb♀ AaBbABabaBAbabaBABAb

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 shows white flowers.

AaBb × AaBb
  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
6.Hard
♂ AaBb♀ AaBbaBAbabABABaBabAb

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

AaBb × AaBb
  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

Answer key

  1. 1. r × r
  2. 2. a × a
  3. 3. XD × Y
  4. 4. Xh × Y
  5. 5. Ab × Ab
  6. 6. Ab × Ab

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