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 Bb parents are crossed. B gives tall plants and is dominant over b, which gives short plants. Click the cell of the Punnett square for an offspring with short plants.

Bb × Bb

1b × b
2b × B
3B × b
4B × B

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 is heterozygous (Aa)?

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 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 tall, round seeds?

AaBb × AaBb

P =

5.Hard

In a population of 5000 in Hardy–Weinberg equilibrium, 4% show a recessive trait. How many individuals N are expected to be homozygous dominant?

N = 5000q² = 0.04

N =

6.Hard

In a population of 1000 in Hardy–Weinberg equilibrium, 16% show a recessive trait. How many individuals N are expected to be homozygous dominant?

N = 1000q² = 0.16

N =

Answer key

1. b × b
2. P = 0.5
3. P = 0.125
4. P = 0.5625
5. N = 3200
6. N = 360

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