Principles of Inheritance and Variation Class 12 MCQ Online Test With Answers Questions

Check the below NCERT MCQ Questions for Class 12 Biology Chapter 5 Principles of Inheritance and Variation with Answers Pdf free download. MCQ Questions for Class 12 Biology with Answers were prepared based on the latest exam pattern. We have provided Principles of Inheritance and Variation Class 12 Biology MCQs Questions with Answers to help students understand the concept very well.

Class 12 Biology Chapter 5 MCQ With Answers

Biology Class 12 Chapter 5 MCQs On Principles of Inheritance and Variation

Class 12 Biology Chapter 5 MCQ Question 1.
Sucess of mendal is
(a) Selection of Peaplant
(b) Studied of free characters
(c) More Characters selection
(d) Pea is Bisexual

Answer

Answer: (a) Selection of Peaplant

Principle Of Inheritance And Variation MCQ Question 2.
Loss of Melanin pigment cause for:
(a) Colourblindness
(b) Depigmentation
(c) Phenyl Ketoneuria
(d) Alkaptoneuria

Answer

Answer: (b) Depigmentation

Chapter 5 Biology Class 12 MCQs Question 3.
Gunetical identification of male human is:
(a) By Nucleus
(b) By cells
(c) By Autosome
(d) By Sex-chromosome

Answer

Answer: (d) By Sex-chromosome

Principles Of Inheritance And Variation MCQ Question 4.
Rh⁺ individual gene may be:
(a) rr
(b) TT
(c) Rr
(d) Both (a) and (c)

Answer

Answer: (c) Rr

Principles Of Inheritance And Variation Class 12 MCQ Question 5.
Cause of chromosomal mutation:
(a) Euploidy
(b) Polyploidy
(c) Physical effect
(d) All of these

Answer

Answer: (d) All of these

MCQ Of Chapter 5 Biology Class 12 Question 6.
Mendal was born in:
(a) 17th century
(b) 18th century
(c) 19th century
(d) 8th century

Answer

Answer: (a) 17th century

MCQ Questions For Class 12 Biology Chapter 5 Question 7.
Two genes very close on a chromosome will show:
(a) No crossing over
(b) High crossing over
(c) Hardly an crossing over
(d) Only double crossing overy

Answer

Answer: (a) No crossing over

MCQs Of Biology Class 12 Chapter 5 Question 8.
First geneticist/father of genetics was:
(a) de Vries
(b) Mendel
(c) Darwin
(d) Morgan

Answer

Answer: (b) Mendel

Class 12 Bio Chapter 5 MCQ Question 9.
An lndividual with into identical alleles is:
(a) Hybrid
(b) Dominant
(c) Homozygous
(d) Heterozygous

Answer

Answer: (c) Homozygous

Biology Class 12 Chapter 5 MCQs Question 10.
Mendal’s law can be applicable only when:
(a) Characters are linked
(b) Parents are pore breed
(c) F₁ generation in monohybrid cross show 2 type of individuals
(d) Onepair of contiasting characters depends on another pair

Answer

Answer: (a) Characters are linked

Principle Of Inheritance And Variation Class 12 MCQ Question 11.
A true hybrid condition is:
(a) tt Rr
(b) Tt rr
(c) tt rr
(d) Tt Rr

Answer

Answer: (c) tt rr

MCQ Chapter 5 Biology Class 12 Question 12.
The allele which is unable to express its effect in the presence of another is called :
(a) Co-dominant
(b) Supplementary
(c) Complementary
(d) Recessive

Answer

Answer: (d) Recessive

Chapter 5 Class 12 Biology MCQ Question 13.
Most of the mutations are:
(a) Recessive
(b) Harmful
(c) Germinal
(d) All of these

Answer

Answer: (a) Recessive

MCQ On Principles Of Inheritance And Variation Question 14.
Smallest segment of genetic material affected by mutation is :
(a) Recon
(b) Cistron
(c) Muton
(d) Exon

Answer

Answer: (c) Muton

Class 12 Biology Ch 5 MCQ Question 15.
Genes located on V-chroinosome are:
(a) Mutant genes
(b) Autosomal genes
(c) Holandric genes
(d) Sex-linked genes

Answer

Answer: (d) Sex-linked genes

Question 16.
A strong mutagen is:
(a) Cold
(b) Heat
(c) Water
(d) X-rays

Answer

Answer: (d) X-rays

Question 17.
A point mutation is:
(a) Thalassemia
(b) Sickel-cell anaemia
(c) Down’s syndrome
(d) Nightblindness

Answer

Answer: (b) Sickel-cell anaemia

Question 18.
Mendel’s second law is of the law of:
(a) Segregation
(b) Dominance
(c) Polygenic inheritance
(d) Independent assortment

Answer

Answer: (d) Independent assortment

Question 19.
An organism with two unlike genes of a trait is called :
(a) Homozygous
(b) Hetrozygous
(c) Both of these
(d) None of these

Answer

Answer: (b) Hetrozygous

Question 20.
Mendel’s laws were discovered by:
(a) Correns
(b) Shermak
(c) de meris
(d) All of these

Answer

Answer: (d) All of these

Question 21.
When F₁ plants heterozygous for tallness are selfed F₂, generation has both tall and dwarf plants. This proves the principle of:
(a) Dominance
(b) Blended inheritance
(c) Law of segregation
(d) Law of independent assortment

Answer

Answer: (c) Law of segregation

Question 22.
Mendel’s formulated the law of purity of gametes on the basis of:
(a) Test cross
(b) Back cross
(c) Monohybrid cross
(d) Dihybrid cross

Answer

Answer: (c) Monohybrid cross

Question 23.
tt mates with Tt. What will be characteristic of offspring:
(a) 75% Ineffective
(b) 50% Uneffective
(c) 25% Uneffective
(d) All Effective

Answer

Answer: (b) 50% Uneffective

Question 24.
Failure of segregation of chromatids during cell division Cycle result in the gain or loss of a cromosome (s) is called :
(a) Female heterogamety
(b) Male heterogamety
(c) Aneuploidy
(d) None of these

Answer

Answer: (a) Female heterogamety

Question 25.
Exception of Mendel’s law is:
(a) Dominance
(b) Purity of gametes
(c) Linkage
(d) Independent assortment

Answer

Answer: (c) Linkage

Question 26.
Haemophilia is a:
(a) Mendelian disorder
(b) Chromosomal disorder
(c) Can be (a) or (b)
(d) None of these

Answer

Answer: (a) Mendelian disorder

Question 27.
Down’s syndrome is a:
(a) Mendelian disorder
(b) Chromosomal disorder
(c) can be both
(d) None of these

Answer

Answer: (b) Chromosomal disorder

Question 28.
Mendel worked on :
(a) Edible pea
(b) Wild pea
(c) Garden Pea
(d) None of these

Answer

Answer: (a) Edible pea

Question 29.
A gamete contains which of the following :
(a) Both alleles of a gene
(b) Only one allele of a gene
(c) Al allele of a gene
(d) No allele

Answer

Answer: (b) Only one allele of a gene

Question 30.
Name the scientist who discovered the law of Heredity :
(a) Gregor Mendel
(b) Newton
(c) Piinnett
(d) None of these

Answer

Answer: (a) Gregor Mendel

Question 31.
Punnett square was developed by:
(a) Mendel
(b) Watson and Sutton
(c) Raginald
(d) Boveri

Answer

Answer: (c) Raginald

Question 32.
Who introduced Chromosomal Theory of Inheritance?
(a) Mendel
(b) Sutton
(c) Reginald
(d) Boveri

Answer

Answer: (b) Sutton

Question 33.
The plant Mendel used to study inheritance of two genes is:
(a) Apple
(b) Mango
(c) Garden pea
(d) Potato

Answer

Answer: (c) Garden pea

Question 34.
Mendel published his work on inheritance of character in?
(a) 1870
(b) 1900
(c) 1865
(d) 1845

Answer

Answer: (c) 1865

Question 35.
Female heterogamety is :
(a) Two different types of gametes are produced by females
(b) Four different types of gametes are produced by males
(c) Can be both (a) and (b)
(d) None of these

Answer

Answer: (a) Two different types of gametes are produced by females

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