Free Printable Genetics - Genotypes and Phenotypes

Worksheets

Genetics - Genotypes and Phenotypes

Total questions: 18

Worksheet time: 8mins

Name

Class

Date

Which of the following is the correct definition for a genotype?

The physical expression of a gene. (Characteristics)

A strand of DNA made up of multiple mutations.

The expression of one of your parents traits.

The set of genes in our DNA which is responsible for a particular trait.

Which of the following genotypes is homozygous dominant?

Which of the following genotypes is heterozygous?

In a heterozygous genotype, the ___________ allele takes over in the phenotype.

recessive

dominant

lower case letter

both

Look at the picture. The probability that a child will inherit the recessive trait is

25%

50%

75%

100%

T - tall and t = short
In the punnett square below, what belongs in the missing square

An example of a heterozygous gene is

An example of a homozygous recessive gene is

DAB

An example of a homozygous dominant gene is

DAB

10.

Dominant alleles are represented by a:

Male gene

lowercase letter

recessive trait

capital letter

11.

Aa, DD, bB, yy are all examples of

genotypes

phenotypes

12.

Alternative forms of a gene are called

Alleles

Homozygous

DNA

Genetics

13.

Hair colour is an example of

genotype

phenotype

14.

If a trait is recessive, it needs to be inherited from ___ parents to be 'expressed'.

one

both

15.

Mark is heterozygous. If B is for brown hair, and b is for blonde hair, what is Mark's genotype?

16.

Punnett Square

a genetic factor that blocks another genetic factor

a genetic factor that is blocked by the presence of a dominant factor

physical appearance of a trait

a model used to predict possible genotypes and phenotypes of offspring

17.

Physical appearance of a trait

gene

allele

genotype

phenotype

18.

Which of the following genotypes is homozygous recessive?

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Genetics - Genotypes and Phenotypes

Total questions: 18

Worksheet time: 8mins

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