Genotype & Phenotype

Front

What is a phenotype?

Back

The observable physical or biochemical characteristics of an organism, determined by both genetic makeup and environmental influences.

Front

What is a genotype?

Back

The genetic constitution of an individual, represented by the alleles inherited from the parents.

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 the difference between dominant and recessive alleles?

Back

Dominant alleles express their trait even when only one copy is present, while recessive alleles require two copies to express their trait.

Front

If a trait is controlled by a single gene with two alleles, how many combinations of alleles can be formed?

Back

Three combinations: homozygous dominant (AA), homozygous recessive (aa), and heterozygous (Aa).

Front

What is an example of a phenotype?

Back

Curly hair, blue eyes, or height.

Front

What is an example of a genotype?

Back

AA, Aa, or aa.

Front

What is the phenotype for a homozygous dominant genotype (e.g., AA) if brown eyes (B) are dominant over blue eyes (b)?

Back

Brown Eyes.

Front

What is the phenotype for a homozygous recessive genotype (e.g., bb) if brown eyes (B) are dominant over blue eyes (b)?

Back

Blue Eyes.