this post was submitted on 08 May 2025
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Close but not quite. 3N plants are sterile. This is because the odd number of chormosomes cannot line up during meiosis and form gametes.
They use diploid pollen 2N pollen to trigger fruit formation but the resulting fruit is parthenocarpic. The white pips and even the occasional colored hard seed coat does not contain an viable embryo.
Crossing of plants with different numbered chormosomes can create fertile offspring if the resulting ploidy is even. For example crossing wheat (6N) with cereal rye (2N) creates Triticale (4N). The Triticale is fertile.
That's not universally true, though. In many instances, 3N plants have reduced fertility, but can still produce viable seed. Even the seedless watermelons, the 3N types, can sometimes produce viable seeds.