AP BIOLOGY

Detailed explanation-1: -The test cross is another fundamental tool devised by Gregor Mendel . In its simplest form, a test cross is an experimental cross of an individual organism of dominant phenotype but unknown genotype and an organism with a homozygous recessive genotype (and phenotype).

Detailed explanation-2: -A test cross is when an unknown genotype is crossed with a homozygous recessive genotype in order to determine the unknown genotype. This genotype can be deduced according to the phenotypes of the offspring.

Detailed explanation-3: -Answer and Explanation: The answer is 50%.

Detailed explanation-4: -Explanation: If all offspring from the test cross display the dominant phenotype, the individual in question is homozygous dominant; if half the offspring display dominant phenotypes and half display recessive phenotypes, then the individual is heterozygous.

Detailed explanation-5: -Answer and Explanation: In a test cross, an individual of unknown genotype is crossed with a homozygous recessive individual to determine the unknown genotype.