Genetics Benchmark 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 does homozygous mean?

Back

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

Front

What is the definition of 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

What is a Punnett Square used for?

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 does the genotype XH Xh represent?

Back

The genotype XH Xh represents a carrier female for an X-linked recessive disorder.

Front

What is the mode of inheritance for traits that appear in every generation?

Back

The mode of inheritance is dominant, as the trait shows up in every generation.

Front

What is the probability of an offspring being purple if both parents are homozygous dominant (PP)?

Back

100% probability of being purple.

Front

What does the genotype X^aY represent?

Back

The genotype X^aY represents a recessive male for an X-linked 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.

Front

What is an example of a homozygous recessive genotype?

Back

An example of a homozygous recessive genotype is 'aa'.