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Explanation:
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The electron density of a polar bond accumulates towards one end of the bond, causing that end to carry a slight negative charge and the other end a slight positive charge. Likewise molecules in which there is an accumulation of electron density at one end of the molecule, giving that end a partial negative charge and the other a partial positive charge, are called polar molecules.
Homologous chromosomes, is a pair of chromosome connected by a centromere. In sexual reproduction, the chromosome of the mother and the chromosome of the father pairs together.