Biology Exam Preparations - Questions and Answers

76 Epistasis implies

A one pair of genes can completely mask the expression of another pair of gene

B one pair of genes independently controls a particular phenotype

C one pair of genes enhances the phenotype expression of another pair of gene

D many genes collectively control a particular phenotype

Answer: Option [A]

77 Whereas the number of chromosomes is reduced to half in first reduction division of meiosis, then what is the need for second mitotic division?

A for the segregation of replicated chromosomes

B for equal distribution of haploid chromosomes

C for the formation of four gametes

D for the equal distribution of genes on chromosomes

Answer: Option [A]

78 The polytene chromosomes were discovered for the first time in

A chironomus

B homozygous

C drosphila

D housefly

Answer: Option [A]

79 The point at which the polytene chromosomes appera to be attached together is known as

A centricle

B chromocentre

C centromere

D chromomere

Answer: Option [B]

80 What is the chromosome number of plasmodium?

A 18

B 14

C 10

D 9

Answer: Option [C]

Biology Exam Preparations - MCQs and answers