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.
Principles of Inheritance and Variation Class 12 MCQs Questions with Answers
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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