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In a population of rabbits, black fur (B) is dominant over white fur (b). If two

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Question: In a population of rabbits, black fur (B) is dominant over white fur (b). If two heterozygous black rabbits (Bb) are mated, what is the expected phenotypic ratio of their offspring?

Options:

  1. 1:1
  2. 3:1
  3. 2:1
  4. 1:2:1

Correct Answer: 3:1

Solution: 

The cross Bb x Bb results in 1 BB (black), 2 Bb (black), and 1 bb (white), giving a phenotypic ratio of 3:1.

In a population of rabbits, black fur (B) is dominant over white fur (b). If two

Practice Questions

Q1
In a population of rabbits, black fur (B) is dominant over white fur (b). If two heterozygous black rabbits (Bb) are mated, what is the expected phenotypic ratio of their offspring?
  1. 1:1
  2. 3:1
  3. 2:1
  4. 1:2:1

Questions & Step-by-Step Solutions

In a population of rabbits, black fur (B) is dominant over white fur (b). If two heterozygous black rabbits (Bb) are mated, what is the expected phenotypic ratio of their offspring?
  • Step 1: Identify the genotypes of the parent rabbits. Both are heterozygous black rabbits, which means their genotypes are Bb.
  • Step 2: Set up a Punnett square to visualize the possible combinations of alleles from the parents. The rows and columns will represent the alleles from each parent.
  • Step 3: Fill in the Punnett square. The combinations will be: BB, Bb, Bb, and bb.
  • Step 4: Count the different genotypes from the Punnett square. You will have 1 BB, 2 Bb, and 1 bb.
  • Step 5: Determine the phenotypes based on the genotypes. BB and Bb both result in black fur, while bb results in white fur.
  • Step 6: Calculate the phenotypic ratio. You have 3 black rabbits (1 BB + 2 Bb) and 1 white rabbit (1 bb), giving a ratio of 3 black to 1 white.
  • Mendelian Genetics – Understanding dominant and recessive traits and how they are inherited through Punnett squares.
  • Phenotypic Ratios – Calculating the expected ratios of observable traits in offspring based on parental genotypes.
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