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Difficulty: EasyGenetics and Heredity

A plant inherits an allele for purple flowers (PP) from one parent and an allele for white flowers (pp) from the other. If purple is dominant over white, which flower color will the plant have?

  1. A
    White flowers
  2. B
    Light pink flowers
  3. Purple flowersAnswer
  4. D
    A mix of purple and white petals

Answer

The plant will have purple flowers.
Because the purple allele (PP) is dominant over the white allele (pp), a plant with the heterozygous genotype (PpPp) will display only the dominant phenotype, which is purple flowers.

Step-by-Step Solution

1
Determine the genotype of the offspring.
The plant inherits one dominant allele (PP) and one recessive allele (pp), giving it the heterozygous genotype PpPp.
Each parent contributes one allele for the trait to the offspring.
2
Apply the rule of complete dominance to find the phenotype.
The dominant allele (PP) completely masks the expression of the recessive allele (pp).
Under standard Mendelian dominance, having at least one dominant allele produces the dominant physical trait.

Key Concept

Dominant and Recessive Allele Expression
Estimated Time:45s
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Topics

Genetics and Heredity

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