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

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

Aa × Aa

1a × a
2a × A
3A × a
4A × A

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 white flowers?

Aa × aa

P =

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 tall, 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, round seeds?

AaBb × Aabb

P =

5.Hard

In a population of 5000 in Hardy–Weinberg equilibrium, 9% show a recessive trait. How many individuals N are expected to be homozygous dominant?

N = 5000q² = 0.09

N =

6.Hard

In a population of 5000 in Hardy–Weinberg equilibrium, 1% show a recessive trait. How many individuals N are expected to be homozygous dominant?

N = 5000q² = 0.01

N =

Answer key

1. A × A
2. P = 0.5
3. P = 0.125
4. P = 0.125
5. N = 2450
6. N = 4050

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