MCQ Questions for Class 12 Biology Chapter 5 Principles of Inheritance and Variation with Answers Set-A

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

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 Quiz

Class 12 Biology Chapter 5 MCQ Online Test

You can refer to NCERT Solutions for Class 12 Biology Chapter 5 Principles of Inheritance and Variation to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Principles of Inheritance and Variation Class 12 Biology MCQ online test

Q1.	If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is
	A.autosomal dominant
	B.autosomal recessive
	C.sex-linked dominant
	D.sex-linked recessive.

Ans: sex-linked recessive.

Q2.	In sickle cell anaemia glutamic acid is replaced by valine. Which one of the following triplets codes for valine ?
	A.GGG
	B.A AG
	C.G A A
	D.GUG

Ans: GUG

Q3.	Person having genotype IA IB would show the blood group as AB. This is because of
	A.pleiotropy
	B.co-dominance
	C.segregation
	D.incomplete dominance.

Ans: co-dominance

Q4.	ZZ/ZW type of sex determination is seen in
	A.platypus
	B.snails
	C.cockroach
	D.peacock

Ans: peacock

Q5.	A cross between two tall plants resulted in offspring having few dwarf plants. What would be the genotypes of both the parents ?
	A.TT and Tt
	B.Tt and Tt
	C.TT and TT
	D.Tt and It

Ans: TtandTt

Q6.	In a dihybrid cross, if you get 9 : 3 : 3 : 1 ratio it denotes that
	A.the alleles of two genes are interacting with each other
	B.it is a multigenic inheritance
	C.it is a case of multiple allelism
	D.the alleles of two genes are segregating independently.

Ans: the alleles of two genes are segregating independently.

Q7.	Which of the following will not result in variations among siblings ?
	A.Independent assortment of genes
	B.Crossing over
	C.Linkage
	D.Mutation

Ans: Linkage

Q8.	Mendel’s Law of independent assortment holds good for genes situated on the
	A.non-homologous chromosomes
	B.homologous chromosomes
	C.extra nuclear genetic element
	D.same chromosome.

Ans: homologous chromosomes

Q9.	Occasionally, a single gene may express more than one effect. The phenomenon is called
	A.multiple allelism
	B.mosaicism
	C.pleiotropy
	D.polygeny.

Ans: pleiotropy

Q10.	In the F2 generation of a Mendelian dihybrid cross the number of phenotypes and genotypes are
	A.phenotypes – 4; genotypes – 16
	B.phenotypes – 9; genotypes – 4
	C.phenotypes – 4; genotypes – 8
	D.phenotypes – 4; genotypes – 9.

Ans: phenotypes – 4; genotypes – 9.

Q11.	The colour based contrasting traits in seven contrasting pairs, studied by Mendel in pea plant were
	A.1
	B.2
	C.3
	D.4

Ans: 3

Q12.	_________ pairs of contrasting traits were studied by Mendel in pea plant.
	A.6
	B.7
	C.8
	D.10

Ans: 7

Q13.	Which of the following characters was not chosen by Mendel ?
	A.Pod shape
	B.Pod colour
	C.Location of flower
	D.Location of pod

Ans: Location of pod

Q14.	Genes which code for a pair of contrasting traits are known as
	A.dominant genes
	B.alleles
	C.linked genes
	D.none of these

Ans: alleles

Q15.	A recessive allele is expressed in
	A.heterozygous condition only
	B.homozygous condition only
	C.F3 generation
	D.both homozygous and heterozygous conditions.

Ans: homozygous condition only

Q16.	The characters which appear in the first filial generation are called
	A.recessive characters
	B.dominant characters
	C.holandric characters
	D.lethal characters

Ans: dominant characters

Q17.	What will be the distribution of phenotypic features in the first filial generation after a cross between a homozygous female and a heterozygous male for a single locus ?
	A.3 : 1
	B.1 : 2 : 1
	C.1 : 1
	D.None of these

Ans: 1 : 1

Q18.	In a monohybrid cross between two heterozygous individuals, percentage of pure homozygous individuals obtained in F₁ generation will be
	A.25 %
	B.50 %
	C.75 %
	D.100 %

Ans: 50 %

Q19.	What is the probability of production of dwarf offsprings in a cross betweeen two heterozygous tall pea plants ?
	A.Zero
	B.50 %
	C.25 %
	D.100 %

Ans: 25 %

Q20.	Which of the following crosses will give tall and dwarf pea plants in same proportions ?
	A.TT × tt
	B.Tt × tt
	C.TT × Tt
	D.tt × tt

Ans: Tt × tt

MCQ Questions for Class 12 Biology

NCERT Solutions for Class 12 Biology

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NCERT SOLUTIONS FOR CLASS 12

MCQ Questions for Class 12 Biology Chapter 5 Principles of Inheritance and Variation with Answers

MCQ Questions for Class 12 Biology Chapter 5 Principles of Inheritance and Variation with Answers Set-A

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

Class 12 Biology Chapter 5 Quiz

Class 12 Biology Chapter 5 MCQ Online Test

Principles of Inheritance and Variation Class 12 Biology MCQ online test

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NCERT Solutions for Class 12 Biology

Class 12 Biologys

NCERT Solutions for Class 12 Biology

NCERT Solutions for Class 12 Biology

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