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

Question

A. If a plant has purple flowers then it's genotype must be Pp b. that's a plant has white wires and it's genotype must be Pp C. if a plant has white flowers then it's genotype must be pp D. if a plant has purple flowers then it's genotype must be PP

Answer 1

In pea plants, the allele for purple flowers (P) is dominant over the allele for white flowers (p). Based on this information, let's evaluate each statement:

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

• This statement is false. A plant with purple flowers could have the genotype PP (homozygous dominant) or Pp (heterozygous).

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

• This statement is false. A plant with white flowers must have the genotype pp, as the white flower trait is recessive.

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

• This statement is true. Since the white flower trait is recessive, a plant with white flowers can only have the genotype pp.

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

• This statement is false. As mentioned, a plant with purple flowers could have either a genotype of PP or Pp.

In conclusion, the only correct statement is: C. If a plant has white flowers then its genotype must be pp.