Questions: The cross of an individual with a dominant phenotype and an unknown genotype with a homozygous recessive individual is known as a mapcross testcross Mendelian cross recombinant cross parental cross

The answer is the second one: testcross.

Explanation for each option:

• Mapcross: This term is not typically used in genetics to describe a specific type of cross. It is incorrect in this context.

• Testcross: A testcross is a genetic cross between an individual with a dominant phenotype but unknown genotype and a homozygous recessive individual. This is done to determine the unknown genotype. If any offspring display the recessive phenotype, the unknown genotype must be heterozygous. This is the correct answer.

• Mendelian cross: This term generally refers to any genetic cross that follows Mendel's laws of inheritance, but it does not specifically describe the cross in question. Therefore, it is incorrect.

• Recombinant cross: This term refers to a cross that results in offspring with combinations of traits that differ from those found in either parent, often due to genetic recombination. It does not specifically describe the cross in question. Thus, it is incorrect.

• Parental cross: This term typically refers to the initial cross between two parent organisms in a genetic study. It does not specifically describe the cross in question. Therefore, it is incorrect.

In summary, the correct answer is testcross, as it specifically describes the cross between an individual with a dominant phenotype and an unknown genotype with a homozygous recessive individual.