Intro to Genetics review

Front

What is the definition of a dominant trait in genetics?

Back

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

Front

What is the definition of a recessive trait in genetics?

Back

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

Front

What does homozygous mean?

Back

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

Front

What does heterozygous mean?

Back

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

Front

What is a phenotype?

Back

A phenotype is the observable physical or biochemical characteristics of an organism, determined by both genetic makeup and environmental influences.

Front

What is a genotype?

Back

A genotype is the genetic constitution of an individual, represented by the alleles inherited from the parents.

Front

What is a Punnett square?

Back

A Punnett square is a diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles.

Front

What is the phenotypic ratio of a cross between Rr and rr?

Back

The phenotypic ratio is 2:2, or 1:1, with 50% rough fur and 50% smooth fur.

Front

What is the phenotypic ratio of a cross between Rr and Rr?

Back

The phenotypic ratio is 3:1, with 75% rough fur and 25% smooth fur.

Front

What is the phenotypic ratio of a cross between RR and rr?

Back

The phenotypic ratio is 4:0, with 100% rough fur.