Question

When a diploid female plant is crossed with tetraploid male what is the ploidy of endosperm cells in the resulting seed??
( The ans is tetraploidy but how?)

Answer 1

✍️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).

Answer 2

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).