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In a certain species, the allele for blue flowers (B) is dominant over the allel

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Question: In a certain species, the allele for blue flowers (B) is dominant over the allele for white flowers (b). If two blue-flowered plants, one homozygous (BB) and one heterozygous (Bb), are crossed, what percentage of the offspring will have white flowers?

Options:

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

Correct Answer: 0%

Solution: 

The cross BB x Bb will produce 100% blue flowers (BB or Bb), so 0% will have white flowers.

In a certain species, the allele for blue flowers (B) is dominant over the allel

Practice Questions

Q1
In a certain species, the allele for blue flowers (B) is dominant over the allele for white flowers (b). If two blue-flowered plants, one homozygous (BB) and one heterozygous (Bb), are crossed, what percentage of the offspring will have white flowers?
  1. 0%
  2. 25%
  3. 50%
  4. 100%

Questions & Step-by-Step Solutions

In a certain species, the allele for blue flowers (B) is dominant over the allele for white flowers (b). If two blue-flowered plants, one homozygous (BB) and one heterozygous (Bb), are crossed, what percentage of the offspring will have white flowers?
  • Step 1: Understand that 'B' is the allele for blue flowers and 'b' is the allele for white flowers.
  • Step 2: Recognize that 'BB' means the plant has two blue flower alleles (homozygous) and 'Bb' means the plant has one blue and one white flower allele (heterozygous).
  • Step 3: Set up the cross between the two plants: one plant is 'BB' and the other is 'Bb'.
  • Step 4: Create a Punnett square to visualize the possible combinations of alleles from the parents.
  • Step 5: Fill in the Punnett square: the top row will have 'B' and 'B' (from the BB parent), and the side will have 'B' and 'b' (from the Bb parent).
  • Step 6: The combinations from the Punnett square will be: 'BB', 'BB', 'Bb', 'Bb'.
  • Step 7: Count the results: 2 'BB' and 2 'Bb', which means all offspring will have blue flowers.
  • Step 8: Conclude that since there are no 'bb' combinations, 0% of the offspring will have white flowers.
  • Mendelian Genetics – Understanding dominant and recessive alleles and how they affect offspring phenotypes.
  • Punnett Squares – Using Punnett squares to predict the genotypic and phenotypic ratios of offspring from genetic crosses.
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