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

ManipalManipal 2007

Solution:

Secondary nucleus of female would have $2n$ chromosome that would be fertilized by male gametes which in this case would be $2n$ because it is formed from tetraploid male. Hence, endosperm would be $ 2n+2n=4n $ .