Question

When a diploid female plant is crossed with a tetraploid male, what will be the pIoidy of endosperm cells in resulting seed?

• A. Tetraploidy
• B. Hexaploidy
• C. Triploidy
• D. Pentaploidy

Answer 1

Answer: (A)

the diploid female produces embryo sac in which egg cell has $n$ and polar nuclei have $2$ (due to the presence of two nuclei) and tetraploid male $(4n)$ produce pollen $(2n)$. During the fertilization process, triple fusion i.e., the fusion of one male nucleus ( $2n$ ) and two polar nuclei $(2n)$ and produces endosperm with $2n+2n=4n$.