The allele which is unable to express its effect in the presence of another is called
Correct answer: D. Recessive
- A. Codominant
- B. Supplementary
- C. Complementary
- D. Recessive
Explanation
The correct option is d): Recessive. The term "recessive" accurately describes an allele that is unable to express its effect in the presence of a dominant allele. A recessive allele is only expressed phenotypically when an individual has two copies of the recessive allele (homozygous recessive). In the presence of a dominant allele, the recessive allele is masked and its effect is not observed in the phenotype of heterozygous individuals. This option is correct because it accurately describes the given scenario.
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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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