Question

A tetraploid male plant is crossed with a diploidfemale plant. What will be the ploidy of embryo [A] and endosperm [B]?
a) A-3n, B - 4n
b) A-4n, B-6n
c) A-4n, B - 4n
d) A-3n, B - On​

Answer 1

Explanation:

Parents: 2n (Diploid female) × 4n (Tetraploid male)

Gametes: n (Female gamete) × 2n (Male gamete)

The endosperm is formed by the process of triple fusion, wherein one male gamete fuses with the two polar nuclei.

In this case, the two polar nuclei are haploid but the male gamete is diploid (2n). Hence, the endosperm would be tetraploid (n + n + 2n = 4n).

so, option A is correct.