Determine whether the statements below are true or false. If a statement is false, provide the correct information or revise the statement to make it correct.

A test cross between a heterozygous parent and a homozygous recessive parent is expected to produce a 1:1 genotypic and phenotypic ratio.

Key Concepts

Test Cross

A test cross is a genetic cross performed to determine the genotype of an individual exhibiting a dominant phenotype. This is done by crossing the individual with a homozygous recessive individual. The offspring's phenotypes reveal the unknown genotype based on the ratios observed in the progeny.

Heterozygous and Homozygous

Heterozygous refers to an organism that has two different alleles for a particular gene, while homozygous means having two identical alleles. In the context of a test cross, a heterozygous parent (e.g., Aa) is crossed with a homozygous recessive parent (e.g., aa) to analyze the inheritance patterns of traits.

Genotypic and Phenotypic Ratios

Genotypic ratios refer to the relative frequencies of different genotypes in the offspring, while phenotypic ratios refer to the relative frequencies of observable traits. In a test cross between a heterozygous and a homozygous recessive parent, the expected offspring would show a 1:1 phenotypic ratio, not a 1:1 genotypic ratio, as the heterozygous parent can produce two types of gametes.