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Question 3#

The human genome contains approximately:

A) 35,000 to 40,000 genes
B) 20,000 to 25,000 genes
C) 25,000 to 30,000 genes
D) 30,000 to 35,000 genes

Correct Answer is C

Comment:

Genome is a collective term for all genes present in one organism. The human genome contains DNA sequences of 3 billion base pairs, carried by 23 pairs of chromosomes. The human genome has an estimated 25,000 to 30,000 genes, and overall, it is 99.9% identical in all people. Approximately 3 million locations where single-base DNA differences exist have been identified and termed single nucleotide polymorphisms. Single nucleotide polymorphisms may be critical determinants of human variation in disease susceptibility and responses to environmental factors.