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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 two heterozygous brown-eyed individuals (Bb) have children, what is the probability that a child will have blue eyes?

Options:

  1. 0%
  2. 25%
  3. 50%
  4. 75%

Correct Answer: 25%

Solution: 

The cross Bb x Bb results in a 1/4 chance of bb (blue eyes), so the probability is 25%.

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 two heterozygous brown-eyed individuals (Bb) have children, what is the probability that a child will have blue eyes?
  1. 0%
  2. 25%
  3. 50%
  4. 75%

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 two heterozygous brown-eyed individuals (Bb) have children, what is the probability that a child will have blue eyes?
  • Step 1: Understand the alleles. The allele for blue eyes is 'b' and is recessive, while the allele for brown eyes is 'B' and is dominant.
  • Step 2: Identify the parents' genotypes. Both parents are heterozygous brown-eyed, which means their genotypes are 'Bb'.
  • Step 3: Set up the Punnett square. Create a 2x2 grid to show the possible combinations of alleles from the parents.
  • Step 4: Fill in the Punnett square. The combinations will be: BB, Bb, Bb, and bb.
  • Step 5: Count the outcomes. There is 1 'bb' (blue eyes), 2 'Bb' (brown eyes), and 1 'BB' (brown eyes).
  • Step 6: Calculate the probability. Out of 4 total combinations, 1 results in blue eyes (bb).
  • Step 7: Convert the count to a probability. The probability of having blue eyes is 1 out of 4, which is 25%.
  • Mendelian Genetics – Understanding dominant and recessive alleles, and how to use Punnett squares to predict offspring genotypes.
  • Probability Calculation – Calculating the probability of specific genotypes in offspring based on parental genotypes.
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