In a test cross, an individual with a dominant phenotype is crossed with which o

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Question: In a test cross, an individual with a dominant phenotype is crossed with which of the following? (2021)

Options:

Correct Answer: Homozygous recessive

Exam Year: 2021

Solution:

In a test cross, an individual with a dominant phenotype is crossed with a homozygous recessive individual to determine its genotype.

In a test cross, an individual with a dominant phenotype is crossed with which of the following? (2021)

In a test cross, an individual with a dominant phenotype is crossed with which of the following? (2021)

Step 1: Understand what a dominant phenotype is. This means the individual shows a trait that is expressed when at least one dominant allele is present.
Step 2: Recognize that we want to find out the genotype of the individual with the dominant phenotype. The genotype is the genetic makeup, which can be either homozygous dominant (two dominant alleles) or heterozygous (one dominant and one recessive allele).
Step 3: To determine the genotype, we perform a test cross. This involves crossing the individual with the dominant phenotype with another individual.
Step 4: The individual we cross with should be homozygous recessive. This means it has two recessive alleles and will only show the recessive trait.
Step 5: Analyze the offspring from this cross. If all offspring show the dominant phenotype, the original individual is likely homozygous dominant. If some offspring show the recessive phenotype, the original individual is heterozygous.

Test Cross – A genetic cross used to determine the genotype of an individual with a dominant phenotype by crossing it with a homozygous recessive individual.
Dominant and Recessive Alleles – Understanding the difference between dominant and recessive traits is crucial for interpreting the results of a test cross.