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 purple 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

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

♀ X^HX^h♂ X^hY

1X^h × Y
2X^h × X^h
3X^H × Y
4X^H × X^h

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, wrinkled seeds?

AaBb × aabb

P =

5.Hard

In a population of 10000 in Hardy–Weinberg equilibrium, 16% show a recessive trait. How many individuals N are expected to be homozygous dominant?

N = 10000q² = 0.16

N =

6.Hard

In a population of 500 in Hardy–Weinberg equilibrium, 1 in 1600 show a recessive trait. How many individuals N are expected to be homozygous dominant?

N = 500q² = 0.000625

N =

Answer key

1. P = 1
2. P = 0.75
3. X^h × X^h
4. P = 0.25
5. N = 3600
6. N = 475.3

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