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Explain how, offspring and parents of or...

Explain how, offspring and parents of organisms reproducing sexually have the same number of chromosomes?

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In sexually reproducing organisms, male and female gametes/reproductive cells with only half the number of chromosomes (as in the parent cell) are produced. During fertilization, when male and female gametes fuse to give rise to a zygote, original number of hromosomes are restored.
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From the internet, gather information about the chromosome numbers of five animals and five plants. Correlate the number with the size of organism and answer the following questions. (a) Do larger organisms have more number of chromosomes/cells? (b) Can organism with fewer chromosomes reproduce more easil than orgamsms with more number of chromosomes? (c) More the number of chromosomes/cells greater is the DNA content. Justify.