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:
A. If a plant has purple flowers, then its genotype must be Pp.
If a plant has purple flowers, then its genotype must be , Pp, .
B. If a plant has purple flowers, then its genotype must be PP.
If a plant has purple flowers, then its genotype must be , PP, .
C. If a plant has white flowers, then its genotype must be Pp.
If a plant has white flowers, then its genotype must be , Pp, .
D. If a plant has white flowers, then its genotype must be pp.
If a plant has white flowers, then its genotype must be , pp, .
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To determine the correct conclusion about the relationship between phenotype and genotype in pea plants with purple and white flowers, we need to understand the principles of dominance and genetic inheritance.
According to the given information, the allele for purple flowers (P) is dominant over the allele for white flowers (p). This means that if an organism carries at least one dominant allele (P), its phenotype will manifest as purple flowers. The recessive allele (p) will only result in the phenotype of white flowers if it is present in a homozygous form, meaning that both alleles are lowercase (pp).
Now, let's analyze each option to find the correct conclusion:
A. If a plant has purple flowers, then its genotype must be Pp.
Explanation: This statement is incorrect because it assumes that the genotype for purple flowers must be heterozygous (Pp). The plant could possess a homozygous genotype (PP) and still display the purple flower phenotype.
B. If a plant has purple flowers, then its genotype must be PP.
Explanation: This statement is also incorrect since it wrongly rephrases the previous option. It assumes that the genotype for purple flowers must be homozygous (PP), excluding the possibility of heterozygous genotype (Pp).
C. If a plant has white flowers, then its genotype must be Pp.
Explanation: This statement is incorrect because it states that the genotype for white flowers must be heterozygous (Pp). The plant could possess a homozygous genotype (pp) and still display the white flower phenotype.
D. If a plant has white flowers, then its genotype must be pp.
Explanation: This statement is the correct conclusion. Due to the given information that the allele for purple flowers (P) is dominant over the allele for white flowers (p), a pea plant expressing a white flower phenotype can only have a homozygous recessive genotype (pp).
Therefore, the correct conclusion is:
D. If a plant has white flowers, then its genotype must be pp.
The correct response is:
D. If a plant has white flowers, then its genotype must be pp.
If a plant has white flowers, then its genotype must be pp.