Question

Which of the following best describes your answer for question number 1? *

O Homozygous dominant
O Homozygous recessive
O Heterozygous

Answer 1

Answer and Explanation:

The correct answer is (a) One individual has the dominant phenotype and the other has the recessive phenotype. A testcross is an experiment performed to determine whether the genotype of an organism with a dominant phenotype is homozygous or heterozygous. The organism is mated with another organism that has a recessive phenotype and therefore a homozygous recessive genotype. If the offsprings of this cross all have the dominant phenotype, then the parent with an unknown genotype was homozygous for the dominant allele. If some offsprings have a recessive phenotype, then the parent must be heterozygous.