Biology 12 Principles Of Inheritance And Variation MCQ Question Answer – Chapter 5

Biology 12 Principles Of Inheritance And Variation : Practice MCQs from Principles Of Inheritance And Variation from this post and score full marks in this chapter. These important MCQs on Principles Of Inheritance And Variation are prepared keeping in mind the latest pattern of Board examination.

These MCQs on Principles Of Inheritance And Variation are provided in this article along with their answers, so it will keep on telling you whether you have selected the right answer or not, and so that you can make your concepts of the chapter Principles Of Inheritance And Variation more stronger.

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Biology 12 Principles Of Inheritance And Variation – Chapter 5


Ques 1: Theory of pangenesis was forwarded by

  • Charles Darwin
  • Gregor Johann Mendel
  • Hugo de Vries
  • Sutton and Boveri

Water hyacinth

Ques 2: Cross which involves the same traits but carried by sexes opposite to those in the original cross in termed

  • Test cross
  • Back cross
  • Reciprocal cross
  • Monohybrid cross

Reciprocal cross

Ques 3: A pure tall pea plant chosen by mendel for cross breeding had the height of:

  • 22-44 cm
  • 44-66 cm
  • 66-99 cm
  • 100-120 cm

100-120 cm

Ques 4: Phenotypic ratio of 1 : 2 : 1 in F2 generation was observed in

  • Mendel’s monohybrid cross
  • Blended inheritance
  • Quantitative inheritance
  • Codominance

Blended inheritance

Biology MCQs Principles of Inheritance and Variation Class 12

Ques 5: ABO blood group in humans is an example of

  • Dominance
  • Codominance
  • Multiple alleles
  • All of these

All of these

Ques 6: Phenotypic traits which show a wide spectrum of phenotypes which imperceptibly blend from one condition to another as continuous variations are called

  • Qualitative traits
  • Quantitative traits
  • Dominant traits
  • Recessive traits

Quantitative traits

Ques 7: The prevention of the expression of one pair of genes by another pair of genes in termed

  • Epistasis
  • Hypostasis
  • Incomplete dominance
  • Linkage

Epistasis

Ques 8: Who showed that genes are carried on chromosomes ?

  • Mendel
  • Johannsen
  • Morgan
  • Sutton and Boveri

Morgan

Ques 9: Name the disorder in humans having the karyotype 22 pairs of autosomes and XO.

  • Klinefelter syndrome
  • Down syndrome
  • Turner syndrome
  • Albinism

Turner syndrome

Principles of Inheritance and Variation MCQs With Solutions

Ques 10: Which of the following has 22 pairs of autosome + 21st chromosome + XY ?

  • Down syndrome
  • Turner syndrome
  • Klinefelter syndrome
  • Immune deficiency syndrome

Down syndrome

Ques 11: Name the pattern of inheritance where F1 phenotype does not resemble either of the two parents and is in between the two.

  • Mendel’s monohybrid cross
  • Epistasis
  • Blended inheritance
  • Quantitative (polygenic) inheritance

Blended inheritance

Ques 12: Systematized representation of the chromosome complement of a cell or organism depicting the characteristics of the chromosomes as seen in metaphase of mitosis is termed

  • Genotype
  • Karyotype
  • Phenotype
  • Phenocopy

Karyotype

Ques 13: Deletion of half of short arm of chromosome 5 in humans results is which disorder ?

  • Monogolism
  • Cri-du-chat syndrome
  • Chronic myloid leukemia
  • Turner syndrome

Cri-du-chat syndrome

Ques 14: The mutations, which alter the entire reading frame of the message, are called

  • Point mutations
  • Mutons
  • Frameshift mutations
  • none of these

Frameshift mutations

Principles of Inheritance and Variation MCQ Questions with Answers

Ques 15: ZW. ZZ type of sec determination is seen in

  • Drosophila
  • Humans
  • Bonellia
  • fishes, reptiles and birds

fishes, reptiles and birds

Ques 16: A dihybrid cross, revealing complete linkage, depicted genotypes in F2 generation in the ration of:

  • 9 : 3 : 3 : 1
  • 7 : 1 : 1 : 7
  • 1 : 1
  • 3 : 1

1 : 1

Ques 17: Mendel’s law of independent assortment holds good for genes situated on the:

  • Homologous chromosomes
  • non-homologous chromosomes
  • same chromosome
  • mutated chromosomes

non-homologous chromosomes

Ques 18: If both the parents are carriers for thalassemia disorder (autosomal recessive). What are the chances of pregnancy resulting in affected child ?

  • 50%
  • 25%
  • 100%
  • No chance

25%

Ques 19: Which is a mismatch ?

  • T.H. Morgan-Linkage
  • ABO blood group – Codominace
  • Trisomy of 21st chromosome – Turner syndrome
  • Multations – Gamma radiations

Trisomy of 21st chromosome – Turner syndrome

Biology 12 MCQ Test Principles Of Inheritance And Variation

Ques 20: Down syndrome is due to

  • Linkage
  • Sex-linked inheritance
  • Crossing over
  • Non-disjunction of chromosome

Non-disjunction of chromosome

Ques 21: X-linked recessive gene is

  • always expressed in male
  • always expressed in female
  • lethal
  • sub-lethal

always expressed in male

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Updated: December 4, 2021 — 3:04 pm

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