Correct option (a) killer strain in Paramecium
Explanation:
Paramecium exhibits cytoplasmic inheritance due to the presence of Kappa particles (self-replicating bodies that produce the toxin called paramecin). Besides binary fission and conjugation, other reproductive processes that occur in Paramecium are autogamy, endomixis and cleistogamy.
Tay Sachs disease It is a rare autosomal recessive genetic disorder.
Colour blindness It is X-chromosome related disease. So, it is a sex-]rnked disease.
PKU autosomal recessive genetic disorder characterised by homozygous or compound heterozygous mutation in the gene.
