HEREDITY
MULTIPLE ALLELES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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An allele that changes the genotype of another allele
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A gene that changes the genotype of another gene
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An allele that controls or masks the expression of another allele
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A gene that controls or masks the expression of another gene
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Detailed explanation-1: -The answers are: 34) (D) A gene that controls or masks the expression of another gene.
Detailed explanation-2: -The correct answer is (c) The effect of one gene being dependent on the presence of one or more ‘modifier genes’. Epistasis occurs when one gene interacts with another to affect its function.
Detailed explanation-3: -Answer and Explanation: d) Fur pattern is controlled by two genes such that one gene inhibits the expression of the other gene. is the only example of epistasis listed.
Detailed explanation-4: -Some genes mask the expression of other genes just as a fully dominant allele masks the expression of its recessive counterpart. A gene that masks the phenotypic effect of another gene is called an epistatic gene; the gene it subordinates is the hypostatic gene.
Detailed explanation-5: -The term ‘epistatic’ was first used in 1909 by Bateson (1) to describe a masking effect whereby a variant or allele at one locus (denoted at that time as an ‘allelomorphic pair’) prevents the variant at another locus from manifesting its effect.