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A purebred snapdragon with red flowers is crossed with a purebred snapdragon with white flowers. The offspring produced have pink flowers. The inheritance pattern indicated by this outcome isacomplete dominance bincomplete dominanceccomplete recessiveness dincomplete recessiveness

Question

A purebred snapdragon with red flowers is crossed with a purebred snapdragon with white flowers. The offspring produced have pink flowers. The inheritance pattern indicated by this outcome isacomplete dominance bincomplete dominanceccomplete recessiveness dincomplete recessiveness

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Solution

The inheritance pattern indicated by the outcome where a purebred snapdragon with red flowers is crossed with a purebred snapdragon with white flowers, and the offspring have pink flowers, is:

b. incomplete dominance

Here's the step-by-step reasoning:

  1. Identify the Parent Genotypes:

    • Purebred red snapdragon: Let's denote the allele for red flowers as R R . Since it is purebred, its genotype is RR RR .
    • Purebred white snapdragon: Let's denote the allele for white flowers as W W . Since it is purebred, its genotype is WW WW .
  2. Cross the Parent Genotypes:

    • When RR RR (red) is crossed with WW WW (white), the offspring will inherit one allele from each parent, resulting in the genotype RW RW .
  3. Determine the Phenotype of the Offspring:

    • In the case of incomplete dominance, the heterozygous genotype RW RW does not result in either the red or white phenotype. Instead, it results in a blend of the two, which is pink flowers.
  4. Conclusion:

    • The fact that the offspring have pink flowers (a blend of red and white) indicates that neither allele is completely dominant over the other. This blending of traits is characteristic of incomplete dominance.

Therefore, the correct answer is: b. incomplete dominance

This problem has been solved

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