What is the probability of obtaining a homozygous recessive offspring from a cro

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Question: What is the probability of obtaining a homozygous recessive offspring from a cross between two heterozygous parents? (2022)

Options:

Correct Answer: 25%

Exam Year: 2022

Solution:

The probability of obtaining a homozygous recessive offspring (aa) from a cross between two heterozygous parents (Aa x Aa) is 25%.

What is the probability of obtaining a homozygous recessive offspring from a cross between two heterozygous parents? (2022)

What is the probability of obtaining a homozygous recessive offspring from a cross between two heterozygous parents? (2022)

Step 1: Identify the genotypes of the parents. Both parents are heterozygous, which means they have one dominant allele (A) and one recessive allele (a). So, their genotypes are Aa and Aa.
Step 2: Set up a Punnett square to visualize the possible combinations of alleles from the parents. The Punnett square will have two rows and two columns.
Step 3: Fill in the Punnett square. The possible combinations from the cross Aa x Aa are: AA, Aa, Aa, and aa.
Step 4: Count the number of homozygous recessive offspring (aa) in the Punnett square. There is 1 'aa' out of 4 total combinations.
Step 5: Calculate the probability. The probability of obtaining aa is the number of aa combinations divided by the total combinations: 1/4 = 25%.

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