Genetics and Probability

Front

What is a homozygous recessive genotype?

Back

A genotype consisting of two identical recessive alleles, such as 'rr'.

Front

What does it mean for parents to be heterozygous?

Back

It means that each parent has two different alleles for a trait, such as 'Aa'.

Front

What is a Punnett square used for?

Back

A tool used to predict the genetic outcomes of a cross between two organisms.

Front

What is the genotypic ratio?

Back

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

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 does the term 'allele' mean?

Back

An allele is a variant form of a gene that can produce different traits.

Front

What is a dominant allele?

Back

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

Front

What is a recessive allele?

Back

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

Front

What is the purpose of a test cross?

Back

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

Front

What is the phenotypic ratio?

Back

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