Define Genotypes and Phenotypes Quick Check

Question

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Question
In pea plants, the allele for purple flowers, P, is dominant over the allele for white flowers, p. Which conclusion about phenotype and genotype is possible?(1 point)
Responses

If a plant has white flowers, then its genotype must be pp.
If a plant has white flowers, then its genotype must be pp .

If a plant has white flowers, then its genotype must be Pp.
If a plant has white flowers, then its genotype must be Pp .

If a plant has purple flowers, then its genotype must be PP.
If a plant has purple flowers, then its genotype must be PP .

If a plant has purple flowers, then its genotype must be Pp.
If a plant has purple flowers, then its genotype must be Pp .
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Answer 1

In this scenario, we can analyze the relationship between genotypes and phenotypes for the pea plants with respect to the flower color trait (purple vs. white).

1. If a plant has white flowers, then its genotype must be pp.

   • This statement is correct because the white flower color is only expressed when the plant has two recessive alleles (pp).

2. If a plant has white flowers, then its genotype must be Pp.

   • This statement is incorrect because Pp would result in purple flowers since the purple allele (P) is dominant.

3. If a plant has purple flowers, then its genotype must be PP.

   • This statement is incorrect because a plant with the genotype Pp (heterozygous) would also exhibit purple flowers due to the dominant allele (P).

4. If a plant has purple flowers, then its genotype must be Pp.

   • This statement is also incorrect for the same reason as above; the plant could be either PP or Pp and still have purple flowers.

Therefore, the only valid conclusion is: If a plant has white flowers, then its genotype must be pp.