Question

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

• A. tetraploidy
• B. pentaploidy
• C. diploidy
• D. triploidy

Answer 1

Answer: (A)

tetraploidy

Answer 2

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 $2n+2n=4n$ .