Simple Genetics

Front

What is a homozygous recessive genotype?

Back

A genotype consisting of two identical recessive alleles, such as 'xx' or 'qq'.

Front

What is a homozygous dominant genotype?

Back

A genotype consisting of two identical dominant alleles, such as 'XX' or 'QQ'.

Front

What is a heterozygous genotype?

Back

A genotype consisting of one dominant and one recessive allele, such as 'Xx' or 'Qq'.

Front

What does the term 'dominant allele' mean?

Back

An allele that expresses its trait even when only one copy is present in the genotype.

Front

What does the term 'recessive allele' mean?

Back

An allele that only expresses its trait when two copies are present in the genotype.

Front

What is a Punnett square?

Back

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

Front

What is the phenotypic ratio in a typical monohybrid cross?

Back

The phenotypic ratio is typically 3:1 for dominant to recessive traits.

Front

What is the genotypic ratio in a typical monohybrid cross?

Back

The genotypic ratio is typically 1:2:1 for homozygous dominant, heterozygous, and homozygous recessive genotypes.

Front

What is the purpose of a test cross?

Back

To determine the genotype of an individual with a dominant phenotype by crossing it with a homozygous recessive individual.

Front

What is the expected percentage of offspring with a dominant phenotype from a cross between two heterozygous parents?

Back

75% of the offspring are expected to show the dominant phenotype.