Question

If there are multiple alleles for a gene which of the following is true?

(a) All the alleles same expressed at the same time

(b) Among the multiple copies resent only the most dominant one is expressed

(c) Only two alleles are present at a time

(d) Only one allele is dominant rest all are recessive

This question was addressed to me by my school principal while I was bunking the class.

My question is based upon Multiple Alleles topic in portion Extension and Deviation from Mendelian Genetic Principles of Cytogenetics

Answer 1

Right choice is (c) Only two alleles are present at a time

Best explanation: If a gene has multiple allele then there are varied dominance recessive relations but ultimately one organism has only 2 of these multiple alleles and the relation among them determines the phenotype.