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(A) In angiosperms,the endosperm is formed by the fusion of one male gamete $(n)$ with two polar nuclei $(n+n)$ or a secondary nucleus $(2n)$. Given:

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Tetraploidy

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(A) In angiosperms,the endosperm is formed by the fusion of one male gamete $(n)$ with two polar nuclei $(n+n)$ or a secondary nucleus $(2n)$. Given: Female plant is diploid $(2n)$,so the polar nuclei are $n$ each. The secondary nucleus is $2n$. Male plant is tetraploid $(4n)$,so the male gamete produced is $2n$. Endosperm ploidy = (Male gamete) + (Secondary nucleus) = $2n + 2n = 4n$ (Tetraploidy).

When a diploid female plant is crossed with a tetraploid male,the ploidy of endosperm cells in the resulting seed is

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