In which of the following is the phenotypic and genotypic ratio the same?
Correct answer: D. Incomplete dominance
- A. Co-dominance
- B. Over dominance
- C. Epistasis
- D. Incomplete dominance
Explanation
In incomplete dominance, the heterozygous phenotype is a blend of the two homozygous phenotypes, resulting in a phenotypic ratio that matches the genotypic ratio. For instance, in snapdragons, crossing red (RR) with white (rr) results in pink (Rr) offspring, where the intermediate phenotype is directly reflective of the genotype. This differs from co-dominance, over dominance, and epistasis, where phenotypic expressions create ratios different from the genotypic ratios due to various interactions and expressions of the alleles.
This question appeared on the ETEA MDCAT 2013 paper, which you can sit online with every answer explained.
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About Mendel's Laws of Inheritance
Mendelian inheritance explains how alleles separate into gametes and assort during reproduction, producing predictable genotype and phenotype ratios. Questions cover dominance, recessiveness, homozygous and heterozygous conditions, the laws of segregation and independent assortment, monohybrid and dihybrid crosses, test crosses and the limits caused by linked genes.
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