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 its genotype must be Pp.

B. 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.

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

Answer 1

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

Answer 2

What is a phenotype of an organism?

A. an observable trait

B. a combination of alleles

C. a structure that carries genetic information

D. a section of DNA

Answer 3

A. an observable trait

Answer 4

What is an allele?

A. a form of a gene

B. the trait a gene controls

C. a dominant form of a gene

D. the location of a gene on a chromosome

Answer 5

A. a form of a gene

Answer 6

Use the table to answer the question.

Plant A Plant B Plant C
tt TT Tt
The table shows the genotypes of three pea plants for the allele for height. Which prediction about the three plants is the most reasonable?

A. Plant C will be the shortest.

B. Plant A and Plant C will have similar heights.

C. Plant B and Plant C will have similar heights.

D. Plant A will be the tallest.

Answer 7

D. Plant A will be the tallest.