Genotype and Phenotype

Front

What is a genotype?

Back

The genetic makeup of an organism, represented by the alleles it possesses (e.g., BB, Bb, bb).

Front

What is a phenotype?

Back

The observable physical or biochemical characteristics of an organism, determined by its genotype (e.g., blue eyes, tall height).

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

Front

What is an example of a homozygous recessive genotype?

Back

aa.

Front

What is an example of a heterozygous genotype?

Back

Bb.

Front

If an organism has the genotype Dd, what can be said about its dominant allele?

Back

The organism has one dominant allele (D) and one recessive allele (d), making it heterozygous.

Front

What phenotype would be expressed by the genotype BB?

Back

The phenotype would express the dominant trait associated with the B allele.

Front

What phenotype would be expressed by the genotype bb?

Back

The phenotype would express the recessive trait associated with the b allele.