Genetics Basics

Front

What does genotype refer to?

Back

The possible combination of alleles in a gene.

Front

What is the term for two alleles/letters for one trait that are different (e.g., Dd)?

Back

Heterozygous.

Front

What is Tt classified as?

Back

Heterozygous.

Front

What is an allele whose trait only shows up when no dominant allele is present?

Back

Recessive allele.

Front

True or False: Dominant traits are expressed when at least one copy of the dominant allele is present.

Back

True.

Front

What is a dominant allele?

Back

An allele that expresses its trait even in the presence of a recessive allele.

Front

What is a recessive allele?

Back

An allele that only expresses its trait when two copies are present.

Front

Define homozygous.

Back

Having two identical alleles for a particular gene (e.g., AA or aa).

Front

Define heterozygous.

Back

Having two different alleles for a particular gene (e.g., Aa).

Front

What is a phenotype?

Back

The physical expression or characteristics of an organism's genotype.