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 is the genotype of a white flower?
- A. RR
- B. Rr
- C. rr
- D. R
Correct Answer: C. rr
Explanation
The correct answer is rr. In order to express the recessive phenotype (white flowers), the organism must have only the recessive allele. When the question stem says that the organism is diploid, it means that each flower has two copies of each chromosome. This means that the flower must have two alleles, so there must be two letters, not just one, in the correct answer.
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