In which of the following cases will the genotypic and phenotypic ratio remain the same in the F2 generation?
Correct answer: D. Incomplete dominance
- A. Law of independent assortment
- B. Law of Segregation
- C. Test cross
- D. Incomplete dominance
Explanation
d) Incomplete dominance:Incomplete dominance is a form of inheritance where the heterozygous phenotype is an intermediate blend of the two homozygous phenotypes. For example, when a red flower (RR) is crossed with a white flower (rr), the F1 generation will have pink flowers (Rr). If the F1 generation (pink flowers) is crossed with each other, the genotypic and phenotypic ratios in the F2 generation will be 1:2:1 (RR:Rr:rr) and 1:2:1 (red phenotype: pink phenotype: white phenotype), respectively. The ratios will remain the same because the alleles segregate independently during gamete formation.
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About Inheritance
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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