Dominant & Recessive Traits

Front

What is a dominant trait?

Back

A dominant trait is a genetic characteristic that is expressed in the phenotype even when only one copy of the gene is present.

Front

What is a recessive trait?

Back

A recessive trait is a genetic characteristic that is only expressed in the phenotype when two copies of the gene are present.

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene, such as AA or aa.

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene, such as Aa.

Front

What is the genotype for round seeds in pea plants?

Back

The genotype for round seeds is represented as RR (homozygous dominant) or Rr (heterozygous).

Front

What is the genotype for wrinkled seeds in pea plants?

Back

The genotype for wrinkled seeds is represented as rr (homozygous recessive).

Front

If a guinea pig has genotype Hh, what color hair does it have?

Back

The guinea pig has black hair because black hair (H) is dominant over yellow hair (h).

Front

What is the phenotype of a homozygous recessive genotype?

Back

The phenotype of a homozygous recessive genotype will express the recessive trait.

Front

What is the difference between genotype and phenotype?

Back

Genotype refers to the genetic makeup of an organism, while phenotype refers to the observable traits or characteristics.

Front

If a plant has the genotype Dd, what can we say about its traits?

Back

The plant will express the dominant trait because D is dominant over d.