Genetics and Heredity

Front

What is a homozygous recessive allele?

Back

A homozygous recessive allele is a pair of identical alleles for a trait that are both recessive, represented as 'tt'.

Front

What is a heterozygous genotype?

Back

A heterozygous genotype consists of two different alleles for a trait, represented as 'Tt'.

Front

What allele dominates in a heterozygous genotype?

Back

The dominant allele takes over in the phenotype.

Front

What is the phenotype of an organism?

Back

The phenotype is the observable physical or biochemical characteristics of an organism, determined by its genotype.

Front

What is the genotype of an organism?

Back

The genotype is the genetic makeup of an organism, consisting of the alleles inherited from its parents.

Front

If a black guinea pig (BB) and a white guinea pig (bb) mate, what is the chance of having a white guinea pig?

Back

There is a 0% chance of having a white guinea pig.

Front

What does it mean if a trait is dominant?

Back

A dominant trait is one that is expressed in the phenotype even when only one copy of the allele is present.

Front

What does it mean if a trait is recessive?

Back

A recessive trait is one that is only expressed in the phenotype when two copies of the allele are present.

Front

What is an example of a phenotype?

Back

An example of a phenotype is blue eyes.

Front

What is the difference between genotype and phenotype?

Back

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