Genetics Terms Review (Punnett Square Terms)

Front

What is a heterozygous genotype?

Back

A heterozygous genotype consists of two different alleles for a particular gene, such as Aa.

Front

What is a homozygous dominant genotype?

Back

A homozygous dominant genotype consists of two identical dominant alleles for a gene, such as AA.

Front

What is a dominant allele?

Back

A dominant allele is an allele that expresses its trait even when only one copy is present, such as having brown eyes (B) over blue eyes (b).

Front

What is a homozygous genotype?

Back

A homozygous genotype consists of two identical alleles for a particular gene, either dominant (AA) or recessive (aa).

Front

What is a phenotype?

Back

A phenotype is the observable physical or biochemical characteristics of an organism, such as blue eyes.

Front

What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses, such as AA, Aa, or aa.

Front

What does it mean for an allele to be recessive?

Back

A recessive allele is an allele that only expresses its trait when two copies are present, such as the allele for brown fur (g) in mice.

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the genetic outcomes of a cross between two organisms.

Front

What is the purpose of a Punnett Square?

Back

The purpose of a Punnett Square is to determine the probability of an offspring inheriting particular genotypes from its parents.

Front

What is the difference between genotype and phenotype?

Back

Genotype refers to the genetic makeup (e.g., AA, Aa, aa), while phenotype refers to the physical expression of that genotype (e.g., brown eyes, blue eyes).