Dominant and Recessive Traits

Front

What is a dominant trait?

Back

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

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What is a recessive trait?

Back

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

Front

Define phenotype.

Back

Phenotype refers to the observable physical or biochemical characteristics of an organism, determined by both genetic makeup and environmental influences.

Front

Define genotype.

Back

Genotype refers to the genetic constitution of an individual, specifically the alleles present for a particular gene.

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene, either dominant (AA) or recessive (aa).

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What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene (e.g., Aa).

Front

What is a Punnett square?

Back

A Punnett square is a diagram used to predict the genotypes of offspring from a genetic cross.

Front

What is the phenotypic ratio?

Back

The phenotypic ratio is the ratio of different phenotypes that appear in the offspring from a genetic cross.

Front

What is the genotypic ratio?

Back

The genotypic ratio is the ratio of different genotypes that appear in the offspring from a genetic cross.

Front

How many alleles are there for each gene?

Back

Typically, there are two alleles for each gene, one inherited from each parent.