Two pea plants are crossed. One plant is homozygous dominant for purple flowers, and the other is homozygous recessive for white flowers. What fraction of the F2 population will have white flowers?
Correct answer: A. 1/4
- A. 1/4
- B. 1/2
- C. 1/8
- D. 1/16
Explanation
When both parents are crossed, we will get an F1 generation with heterozygous purple flowers. When F1 is crossed with F2, we get the following ratio. Purple-flowered: white-flowered 3: 1 Hence, ¼ of the plants will have white flowers. Option A is the correct option.
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Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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