Your neighbor has a flower garden in which there are red flowers and white flowers....
BIOLOGY
SAT 2021
Your neighbor has a flower garden in which there are red flowers and white flowers. These flowers are diploid organisms, and flower color is an autosomal trait. The gene for red flowers (R) is dominant, while the gene for white flowers (r) is recessive. Which of the following could be the genotype of a red flower?
- A. rr only
- B. Rr only
- C. Rr or rr only
- D. RR or Rr only
Correct Answer: D. RR or Rr only
Explanation
A red flower must have the R allele, which conveys the red phenotype. Since this red allele is dominant, the flower will be red as long as one copy of this allele is present. Thus, the genotypes Rr and RR will both produce red flowers. If no red allele is present (rr), the flower will be white.
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