Genetics quiz 2

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?

• A
• Aa
• AA
• aa

Which of the following genotypes is heterozygous?

• Bb
• BB
• bb
• B

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

• recessive
• dominant
• lower case letter
• both 

An example of a heterozygous gene is

• FF

• ff

• Ff

An example of a homozygous recessive gene is

• Dd

• DD

• dd

• DAB

An example of a homozygous dominant gene is

• Dd

• DD

• dd

• DAB

Aa, DD, bB, yy are all examples of

• genotypes
• phenotypes

Hair colour is an example of

• genotype
• phenotype

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

• BB
• bb
• Bb
• bB