Principles of Inheritance and Variation-CBSE Class 12th NCERT Solution

Get, detailed solutions to the questions of the chapter Principles of Inheritance and Variationfrom NCERT textbooks

Jagran Josh
May 28, 2018, 14:11 IST

Get, detailed solutions to the questions of the chapter Principles of Inheritance and Variation from NCERT textbooks. The objective is to helping students regarding the pattern of answering the question as per the cbse latest marking provided you NCERT solutions for classes 12th math and science subjects.


Some questions of this chapter are given here

Q. Mention the advantages of selecting pea plant for experiment by Mendel.

Answer. Pea plants were having seven contrasting traits like tall and dwarf, yellow and green seeds. These contrasting characters helped a lot to Mendel and he also chosen true breeding pea plant varieties.

Differentiate between the following –

a) Dominance and Recessive

b) Homozygous and Heterozygous

c) Monohybrid and Dihybrid.


a) Dominance – Trait which suppresses the effect of other trait. E.g. tallness suppresses dwarfness.

Recessive – Trait which is suppressed by the effect of other trait. E.g. dwarfness is suppressed by tallness.

b) Homozygous – Genotype comprising of similar allele. E.g. tt or TT

Heterozygous – Genotype comprising contrasting allele. E.g. Tt

c) Monohybrid – When genes control only one factor.


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Q. A diploid organism is heterozygous for 4 loci, how many types of gametes can be produced?

Answer. Loci are the place on the chromosome where genes lie. So, loci and genes are synonyms words. If a diploid organism is heterozygous for 4 loci then it will have four contrasting traits. Aa, Bb, Cc, Dd and during meiosis 16 different kinds of gametes will be formed.

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