The type of gene interaction in which the effect caused by a gene at one locus interfere with the effect caused by another gene at another locus is known as:
Correct answer: B. Epistasis
- A. Pleiotropy
- B. Epistasis
- C. Polygenic inheritance
- D. Gene linkage
- E. Crossing over
Explanation
Option A refers to the phenomenon in which one gene has multiple phenotypic expressions. This is not what the question is referring to primarily.Option B refers to the interaction of different genes (not alleles) i.e. one gene on a particular locus interferes with the effects of another independently inherited gene at another locus. This is exactly what the question is asking for.Option C refers to when multiple genes have an additive or cumulative effect in producing a certain phenotype, for example height is determined by the effect of numerous different genes and so height is a polygenic trait. Option D refers to two genes close together on a single chromosome are inherited together.Option E refers to the exchange of genetic material between homologous chromosomes during meiosis.
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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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