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 white flowers?

Aa × Aa

P =

3.Medium

red-green colour blindness is X-linked recessive (allele b). A carrier mother, X^BX^b, has children with an unaffected father, X^BY. The mother's gametes run down the side. Click the cell for an unaffected son.

♀ X^BX^b♂ X^BY

1X^b × Y
2X^b × X^B
3X^B × Y
4X^B × X^B

4.Medium

♀ X^BX^b♂ X^BY

1X^B × X^B
2X^B × Y
3X^b × X^B
4X^b × Y

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 1000 in Hardy–Weinberg equilibrium, 9% show a recessive trait. How many individuals N are expected to be homozygous dominant?

N = 1000q² = 0.09

N =

Answer key

1. P = 1
2. P = 0.25
3. X^B × Y
4. X^b × Y
5. N = 3600
6. N = 490

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