If we cross round (RR) seeded plants with wrinkled (rr) seed plants, and get F1 round seeded. In the F2 generation, what will be the genotypic ratio of plants to try the Punnett square method?
Correct answer: E. 1:2:1
- A. 3:1
- B. 1:1
- C. 2:1
- D. 1:1:2
- E. 1:2:1
Explanation
When a round-seeded plant (RR) is crossed with a wrinkled-seeded plant (rr), the F1 generation will be Rr, with a genotype of one dominant and one recessive allele. In the F2 generation, the possible genotypes are RR, Rr, and rr, with a ratio of 1:2:1 respectively. Therefore, the genotypic ratio in the F2 generation will be 1:2:1.
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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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