Biology for IGCSE & O level - Inheritance (Section 10 - No. 50)

What is the purpose of the testcross?

To determine if an individual is homozygous or heterozygous for a dominant trait.

To determine the sex of an individual.

To predict the phenotype of the offspring.

To identify the location of a gene on a chromosome.

Testcrosses are used to determine the genotype of an individual expressing the dominant phenotype.