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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Only the important parts of the base sequence of the original DNA are conserved during replication.
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Only one strand of the double stranded DNA is replicated.
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Both DNA molecules resulting from replication have one of the original strands and one newly synthesized strands.
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DNA replication occurs in only half of the chromosomes during each cell cycle.
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Detailed explanation-1: -DNA replication is semiconservative, meaning that each strand in the DNA double helix acts as a template for the synthesis of a new, complementary strand. This process takes us from one starting molecule to two “daughter” molecules, with each newly formed double helix containing one new and one old strand.
Detailed explanation-2: -One of the most important concepts of DNA replication is that it is a semi-conservative process (Figure 7.2. 7). This means that every double helix in the new generation of an organism consists of one complete “old” strand and one complete “new” strand wrapped around each other.
Detailed explanation-3: -Conservative Model – An entirely new molecule is synthesised from a DNA template (which remains unaltered) Semi-Conservative Model – Each new molecule consists of one newly synthesised strand and one template strand. Dispersive Model – New molecules are made of segments of new and old DNA.