Question

The male gametes is x and egg is $3x$. The ploidy level in embryo and endosperm will be?

• A. $4x$ in embryo and $4x$ in endosperm
• B. $4x$ in embryo and $7x$ endosperm
• C. $4x$ in embryo and $6x$ in endosperm
• D. $6x$ in embryo and $12x$ in endosperm

Answer 1

The correct option is B $4x$ in embryo and $7x$ endosperm

The embryo is formed by the fusion of male gamete with egg, hence ploidy of embryo, in this case, will be $x+3x=4x$.

While endosperm is formed by the fusion of polar nuclei with the male gamete. Polar nuclei are part of embryo sac where they show ploidy double of egg i.e. $3x\times 2=6x$ in this case. Hence, ploidy of endosperm will be $x+6x=7x$.

So, the correct option is '$4x$ in embryo and $7x$ endosperm'.