The polygenic genes show:
Correct answer: C. Different phenotypes
- A. Different karyotypes
- B. Different genotypes
- C. Different phenotypes
- D. None of these
Explanation
Polygenic inheritance involves the combined effect of multiple genes on a single trait, leading to continuous variation in the phenotype. This is why traits like height, skin color, and weight, which are influenced by polygenic inheritance, exhibit a range of expressions. Option C is correct because it accurately reflects this phenotypic variation. Option A is incorrect because karyotypes are not affected by polygenic inheritance. Option B is incorrect because while genotypes contribute to the trait, the focus of polygenic inheritance is on phenotypic variation rather than genotypic differences. Option D is incorrect because different phenotypes do result from polygenic inheritance.
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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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