How do fruits become seedless?

Question

I have seen seedless watermelons and grapes. How did this happen. Where they grown that way? If they were, what would be the point of a watermelon with no seeds?

Answer 1

take out the seeds

Answer 2

In botany and horticulture, parthenocarpy (literally meaning virgin fruit) is the natural or artificially induced production of fruit without fertilization of ovules.

The fruit is therefore seedless

Answer 3

to keep it simple, the plants aren't fertlized by pollen. Since there is no pollen, then the stamens don't produce seeds.

Answer 4

multiple ways:

Watermelons are crossed so that there are polyploidy (alloploidy) varieties, meaning they have multiple, and uneven sets of chromosomes (humans and most animals have sets of 2, or even 4). Because of this the product of meiosis is an infertile offspring...aka... no seeds.

Grapes and bananas are also controlled by hormonal influence by the farmer, to induce the fruit to develop in absence of fertilization. This is called parthenogenesis.

Answer 5

Seedless watermelons are triploid (three copies of a genome). Any organism with odd-numbered copies of a genome tends to be sterile, and in this case, seedless. They are produced by crossing a diploid (2x) with a tetraploid (4x) watermelon.

In the case of grapes, it is artificially induced parthenocarpy. The grapes are treated with hormones (gibberelic acid) to help along fruit development in the absence of seeds.