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Biology Exam Preparations - MCQs and answers

Questions
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]

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UPSC Biology Questions & Answers

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