PGIMER Frequently Asked MCQ Topics | polymorphism

True about polymorphism is 

a. Single locus - multiple normal alleles 
b. Single locus - multiple abnormal alleles 
c. Single phenotype - Single locus - multiple abnormal alleles 
d. Single phenotype: Single locus-multiple normal alleles. 
e. Multiple loci--- multiple alleles

Ans. (D) Single phenotype, single locus, multiple normal allele

Polymorphisms are normal variation in DNA sequence that have frequency of at least 1%. Usually, they don’t result in a perceptible phenotype i.e. phenotype same.

• They constitute:

- Single base-pair substitution (often) Deletions ‘and insertions