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 physical appearance or observable traits of an organism.

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).

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 relationship between genotype and phenotype?

Back

Genotype determines the phenotype; the genetic makeup influences the physical traits.

Front

What does it mean if an organism is homozygous recessive?

Back

It has two recessive alleles for a trait (e.g., aa).