In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seeded plant is crossed with a green seeded plant, what ratio of yellow and green seeded plants would you expect in F1 generation?
Correct answer: D. 50 : 50
- A. 9 : 1
- B. 1 : 3
- C. 3 : 1
- D. 50 : 50
Explanation
Yellow (Y) seeds are dominant to green (y). So, a heterozygous yellow seeded plant will have the genotype of (Yy) and a green seeded plant will have a genotype of (yy). When these two plants are crossed, the F1 generation will have the ratio of yellow : green as 50 : 50.
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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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