4. What are genes ? Mention their importance
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(i)Nucleus contains thread-like structure called chromosomes. These carry genes.
(ii) Genes is a unit of inheritance in living organisms.
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Genes are the set of instructions that determine what the organism is like, it's appearence, how it survives, how it behaves in its environment. They are mode of substance called deoxyrebonuclei acid or DNA. They give instructions for a living being to make molecule called protein.
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