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?
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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%.
