Genotype and Phenotype

Front

What is a genotype?

Back

The genetic makeup of an organism, represented by the alleles it possesses.

Front

What is a phenotype?

Back

The observable physical or biochemical characteristics of an organism, determined by its genotype.

Front

What does homozygous mean?

Back

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

Front

What does heterozygous mean?

Back

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

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 (homozygous recessive).

Front

How are dominant alleles represented?

Back

By uppercase letters (e.g., A).

Front

How are recessive alleles represented?

Back

By lowercase letters (e.g., a).

Front

What is the genotype for homozygous dominant?

Back

Two dominant alleles (e.g., BB).

Front

What is the genotype for homozygous recessive?

Back

Two recessive alleles (e.g., aa).