THE MOLECULAR BASIS OF INHERITANCE
DNA REPLICATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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How many DNA molecules are in a single chromosome?
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One
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Two
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Four
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The number varies
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Explanation:
Detailed explanation-1: -Each chromosome contains a single very long, linear DNA molecule. In the smallest human chromosomes this DNA molecule is composed of about 50 million nucleotide pairs; the largest chromosomes contain some 250 million nucleotide pairs. The diploid human genome is thus composed of 46 DNA molecules of 24 distinct types.
Detailed explanation-2: -One chromosome in each pair is inherited from one’s mother and one from one’s father. Each chromosome is a single molecule of DNA.
Detailed explanation-3: -Definition. Following DNA replication, as part of cell division, each chromosome consists of two full length DNA molecules joined at the centromere. Each of these DNA molecules is a chromatid.
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