NCERT/Class 12/Biology/Principles of Inheritance and Variation

Principles of Inheritance and Variation

Class 12 · Biology

47 questions26 easy13 medium8 hard

Sample Questions

Q1.Linked genes are genes that:

  • AAre on the same chromosome
  • BAlways produce the same phenotype
  • CCannot recombine
  • DAre always dominant

Q2.In a dihybrid heterozygous cross (AaBb), the recombination frequency between the two genes is 10%. The expected number of recombinant gamete types is:

  • A10% of total gametes
  • B5% of each recombinant type
  • C20% of total gametes
  • D50% of total gametes

Q3.The probability of getting three sons in three consecutive births is:

  • A1/2
  • B1/4
  • C1/8
  • D3/8

Q4.In a testcross involving three genes with known distances (A-B = 10 m.u., B-C = 5 m.u.), the most frequent class in offspring would be:

  • ADouble crossover type
  • BSingle crossover type
  • CParental type
  • DAll equally frequent

Q5.A 9:3:3:1 ratio in F2 generation indicates:

  • ASingle gene with dominance
  • BTwo genes assorting independently
  • CThree genes involved
  • DIncomplete dominance

Q6.This is a sample question to preview what you'll get in the full practice test...

  • A. Option one
  • B. Option two
  • C. Option three
  • D. Option four
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Concepts Covered

Alleles and genesBackcrossChromosome theoryDihybrid crossDominance and recessivenessGenetic mappingLaw of independent assortmentLaw of segregationLinkage and crossing overMendel's lawsMonohybrid crossMultiple allelesPedigree analysisTest cross

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