The unknown genotype of an individual with a dominant phenotype can be determined using what?

Is it a test cross???? Please help!

Yes, it is a test cross.

thank you so much :)

Yes, you are correct! To determine the unknown genotype of an individual with a dominant phenotype, a test cross can be performed. Here's how:

1. Identifying the dominant phenotype: First, you need to identify the individual's dominant phenotype and make sure it is indeed dominant. This means that the individual must display the phenotype that is expressed when at least one copy of the dominant allele is present.

2. Identifying the recessive phenotype: Next, you need to find a suitable mate with a known recessive phenotype. The known recessive individual should have a homozygous recessive genotype for the trait in question, meaning they have two copies of the recessive allele.

3. Crossbreeding: Once you have identified the dominant and recessive individuals, you can crossbreed them. This involves mating the individual with the dominant phenotype (the unknown genotype) with the individual of known recessive phenotype.

4. Analyzing the offspring: The outcome of the test cross will provide valuable information about the unknown genotype. If the offspring display the dominant phenotype, it suggests that the unknown individual is heterozygous (carrying one copy of the dominant allele and one copy of the recessive allele). However, if the offspring display the recessive phenotype, it indicates that the unknown individual is homozygous dominant (carrying two copies of the dominant allele).

By performing a test cross and observing the phenotypes of the resulting offspring, you can determine the genotype of the individual with the dominant phenotype.