Which of the following represents a test cross? (2020)

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Question: Which of the following represents a test cross? (2020)

Options:

Correct Answer: AA x aa

Exam Year: 2020

Solution:

A test cross is performed by crossing an individual with a homozygous recessive individual (AA x aa) to determine the genotype of the former.

Which of the following represents a test cross? (2020)

Which of the following represents a test cross? (2020)

Step 1: Understand what a test cross is. A test cross is a way to find out the genotype of an individual with a dominant trait.
Step 2: Know that the individual with the dominant trait could either be homozygous dominant (AA) or heterozygous (Aa).
Step 3: To perform a test cross, you cross the individual with a homozygous recessive individual (aa).
Step 4: If the offspring show only dominant traits, the original individual is homozygous dominant (AA).
Step 5: If the offspring show a mix of dominant and recessive traits, the original individual is heterozygous (Aa).

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