Class 12 Biology MCQ – Molecular Basis of Inheritance – Salient Features of HGP


This set of Class 12 Biology Chapter 6 Multiple Choice Questions & Answers (MCQs) focuses on “Molecular Basis of Inheritance – Salient Features of HGP”.

1. How many nucleotides are present in the human genome?
a) 3164.7 million
b) 2015.9 million
c) 1982.0 million
d) 3247.9 million
View Answer

Answer: a
Explanation: Nucleotides are the organic carbon molecules. They contain both a nucleoside and a phosphate group. Inside the human genome, there is a total of 3164.7 million nucleotides.

2. Which of the following chromosome has the least number of genes in them?
Chromosome Y is the chromosome with the least number of genes in them
a) Chromosome 1
b) Chromosome 10
c) Chromosome X
d) Chromosome Y
View Answer

Answer: d
Explanation: Chromosome 1 has the greatest number of genes in comparison to the other chromosomes. It has a total of 2,968 genes. While on the other hand, chromosome X has the least number of genes. It has a total of only 231 genes.

3. Repeated sequence makes a large portion of the human genome.
a) True
b) False
View Answer

Answer: a
Explanation: DNA contains many repeated sequences in it. Sometimes it is noted to have more than hundreds or thousands of sequences in them. These sequences might not possess any direct coding functions in them. This altogether makes the large portion of the human genome.
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