Dominant, Recessive, Heterozygous and homozygous Genotypes.

Front

What is a dominant allele?

Back

A dominant allele is a variant of a gene that will express its trait even if only one copy is present in the genotype.

Front

What is a recessive allele?

Back

A recessive allele is a variant of a gene that only expresses its trait when two copies are present in the genotype.

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene, either both dominant (e.g., RR) or both recessive (e.g., rr).

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene, one dominant and one recessive (e.g., Rr).

Front

What is the genotype of a guinea pig with smooth fur if rough fur (R) is dominant?

Back

The genotype is rr.

Front

What is the phenotype of a guinea pig with the genotype BB?

Back

The phenotype is brown fur.

Front

What is the phenotype of a guinea pig with the genotype bb?

Back

The phenotype is white fur.

Front

If an organism has the genotype Tt, what is its genotype classification?

Back

The organism is heterozygous.

Front

If an organism has the genotype tt, what is its genotype classification?

Back

The organism is homozygous recessive.

Front

What is the relationship between genotype and phenotype?

Back

Genotype refers to the genetic makeup of an organism, while phenotype refers to the observable traits expressed by that genotype.