Genotype & Phenotype

Front

What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses (e.g., PP, Pp, pp).

Front

What is a phenotype?

Back

A phenotype is the observable physical or biochemical characteristics of an organism, determined by its genotype and environment (e.g., purple flowers, blue eyes).

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene (e.g., AA or aa).

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene (e.g., Aa).

Front

If a plant has the genotype Pp, what is its phenotype?

Back

The phenotype would be purple flowers, as purple (P) is dominant over white (p).

Front

What is the phenotype of a homozygous recessive genotype (e.g., pp)?

Back

The phenotype would be white flowers, as the recessive trait is expressed.

Front

What is the difference between genotype and phenotype?

Back

Genotype refers to the genetic composition, while phenotype refers to the physical expression of that genotype.

Front

What is an example of a phenotype?

Back

Examples of phenotypes include flower color, eye color, and hair texture.

Front

What does it mean if a trait is dominant?

Back

A dominant trait is one that is expressed in the phenotype even if only one copy of the allele is present (e.g., P in Pp).

Front

What does it mean if a trait is recessive?

Back

A recessive trait is only expressed in the phenotype if two copies of the allele are present (e.g., pp).