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In a certain species, the allele for blue eyes (b) is recessive to the allele fo

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Question: In a certain species, the allele for blue eyes (b) is recessive to the allele for brown eyes (B). If a brown-eyed man (Bb) marries a blue-eyed woman (bb), what is the probability that their child will have blue eyes?

Options:

  1. 0%
  2. 25%
  3. 50%
  4. 100%

Correct Answer: 50%

Solution: 

The cross Bb x bb results in 50% Bb (brown) and 50% bb (blue), so the probability of having a blue-eyed child is 50%.

In a certain species, the allele for blue eyes (b) is recessive to the allele fo

Practice Questions

Q1
In a certain species, the allele for blue eyes (b) is recessive to the allele for brown eyes (B). If a brown-eyed man (Bb) marries a blue-eyed woman (bb), what is the probability that their child will have blue eyes?
  1. 0%
  2. 25%
  3. 50%
  4. 100%

Questions & Step-by-Step Solutions

In a certain species, the allele for blue eyes (b) is recessive to the allele for brown eyes (B). If a brown-eyed man (Bb) marries a blue-eyed woman (bb), what is the probability that their child will have blue eyes?
  • Step 1: Identify the alleles. The brown eye allele is represented by 'B' and the blue eye allele is represented by 'b'.
  • Step 2: Determine the genotypes of the parents. The man has the genotype 'Bb' (brown eyes) and the woman has the genotype 'bb' (blue eyes).
  • Step 3: Set up a Punnett square to visualize the possible combinations of alleles from the parents.
  • Step 4: Fill in the Punnett square. The man can pass on either 'B' or 'b', and the woman can only pass on 'b'.
  • Step 5: The possible combinations from the Punnett square are: 'Bb' (brown eyes) and 'bb' (blue eyes).
  • Step 6: Count the outcomes. There are 2 possible outcomes: 1 'Bb' and 1 'bb'.
  • Step 7: Calculate the probability of having a blue-eyed child. There is 1 'bb' out of 2 total outcomes, which is 1/2 or 50%.
  • Step 8: Conclude that the probability of their child having blue eyes is 50%.
  • Mendelian Genetics – Understanding dominant and recessive alleles and how they affect phenotypes.
  • Punnett Square – Using a Punnett square to predict the genotypic and phenotypic ratios of offspring.
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