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

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?

Aa × Aa

P =

2.Easy

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?

Aa × aa

P =

3.Medium

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

♀ X^DX^d♂ X^dY

1X^d × Y
2X^d × X^d
3X^D × Y
4X^D × X^d

4.Medium

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

♀ X^DX^d♂ X^DY

1X^D × X^D
2X^D × Y
3X^d × X^D
4X^d × Y

5.Hard

A recessive condition affects 1% of a population in Hardy–Weinberg equilibrium. What fraction f of the population are carriers (heterozygous)?

q² = 0.01

f =

6.Hard

A recessive condition affects 1 in 10000 of a population in Hardy–Weinberg equilibrium. What fraction f of the population are carriers (heterozygous)?

q² = 0.0001

f =

Answer key

1. P = 0.25
2. P = 0.5
3. X^D × Y
4. X^d × Y
5. f = 0.18
6. f = 0.0198

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