Explanation:
DNA replication starts with the unzipping of the DNA helixes which are held together by the hydrogen bonds.
Helicase enzyme is responsible for the breaking of hydrogen bonds between nucleotides of the DNA strand thus separating two strands of the DNA.
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In the above pedigree, assume that no outsider marrying in, carry a disease. Write the genotypes of $C$ and $D$.
$(A)$ Tropical latitudes have remained relatively undisturbed for millions of years and thus had a long evolutionary
time for species diversification.
$(B)$ Tropical environments are more seasonal and less predictable than temperates.
$(C)$ There is more solar energy available which contributes to higher productivity.