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 is heterozygous (Aa)?

Aa × aa

P =

2.Easy

Two Aa parents are crossed. A gives tall plants and is dominant over a, which gives short plants. Click the cell for an offspring that has tall plants and is homozygous.

Aa × Aa

1A × A
2A × a
3a × A
4a × a

3.Medium

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?

AaBb × Aabb

P =

4.Medium

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?

AaBb × aabb

P =

5.Hard

In a population of 1000 in Hardy–Weinberg equilibrium, 1 in 1600 show a recessive trait. How many individuals N are expected to be homozygous dominant?

N = 1000q² = 0.000625

N =

6.Hard

In a population of 10000 in Hardy–Weinberg equilibrium, 1 in 10000 show a recessive trait. How many individuals N are expected to be homozygous dominant?

N = 10000q² = 0.0001

N =

Answer key

1. P = 0.5
2. A × A
3. P = 0.125
4. P = 0.25
5. N = 950.6
6. N = 9801

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