CBSE Class 12 Biology – MCQ and Online Tests – Unit 5 – Principles of Inheritance and Variation
Every year CBSE conducts board exams for 12th standard. These exams are very competitive to all the students. So our website provides online tests for all the 12th subjects. These tests are also very effective and useful for those who preparing for competitive exams like NEET, JEE, CA etc. It can boost their preparation level and confidence level by attempting these chapter wise online tests.
These online tests are based on latest CBSE Class 12 syllabus. While attempting these our students can identify the weak lessons and continuously practice those lessons for attaining high marks. It also helps to revise the NCERT textbooks thoroughly.
CBSE Class 12 Biology – MCQ and Online Tests – Unit 5 – Principles of Inheritance and Variation
Question 1.
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
Question 2.
First geneticist/father of genetics was:
(a) de Vries
(b) Mendel
(c) Darwin
(d) Morgan
Answer
Answer: (b) Mendel
Question 3.
Cause of chromosomal mutation:
(a) Euploidy
(b) Polyploidy
(c) Physical effect
(d) All of these
Answer
Answer: (d) All of these
Question 4.
An lndividual with into identical alleles is:
(a) Hybrid
(b) Dominant
(c) Homozygous
(d) Heterozygous
Answer
Answer: (c) Homozygous
Question 5.
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
Question 6.
A true hybrid condition is:
(a) tt Rr
(b) Tt rr
(c) tt rr
(d) Tt Rr
Answer
Answer: (c) tt rr
Question 7.
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 8.
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
Question 9.
Most of the mutations are:
(a) Recessive
(b) Harmful
(c) Germinal
(d) All of these
Answer
Answer: (a) Recessive
Question 10.
Smallest segment of genetic material affected by mutation is :
(a) Recon
(b) Cistron
(c) Muton
(d) Exon
Answer
Answer: (c) Muton
Question 11.
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 12.
A strong mutagen is:
(a) Cold
(b) Heat
(c) Water
(d) X-rays
Answer
Answer: (d) X-rays
Question 13.
A point mutation is:
(a) Thalassemia
(b) Sickel-cell anaemia
(c) Down’s syndrome
(d) Nightblindness
Answer
Answer: (b) Sickel-cell anaemia
Question 14.
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 15.
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 16.
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 17.
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 18.
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 19.
Mendel’s laws were discovered by:
(a) Correns
(b) Shermak
(c) de meris
(d) All of these
Answer
Answer: (d) All of these
Question 20.
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
Question 21.
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 22.
Loss of Melanin pigment cause for:
(a) Colourblindness
(b) Depigmentation
(c) Phenyl Ketoneuria
(d) Alkaptoneuria
Answer
Answer: (b) Depigmentation
Question 23.
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
Question 24.
Mendel worked on :
(a) Edible pea
(b) Wild pea
(c) Garden Pea
(d) None of these
Answer
Answer: (a) Edible pea
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.
Rh+ individual gene may be:
(a) rr
(b) TT
(c) Rr
(d) Both (a) and (c)
Answer
Answer: (c) Rr
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.
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 29.
Mendal was born in:
(a) 17th century
(b) 18th century
(c) 19th century
(d) 8th century
Answer
Answer: (a) 17th century
Question 30.
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
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