| haploidische und diploidische Generation vorzuschlagen | The zygoid state of a species may be diploid or polyploid |
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| Ancestral ploidy levels [ ] It is possible on rare occasions for ploidy to increase in the , which can result in offspring and ultimately polyploid species | When a human undergoes meiosis, the diploid 46 chromosome complement is split in half to form haploid gametes |
After fusion of a male and a female gamete each containing 1 set of 23 chromosomes during , the resulting again has the full complement of 46 chromosomes: 2 sets of 23 chromosomes.
16| The term "dihaploid" was coined by Bender to combine in one word the number of genome copies diploid and their origin haploid | As a result, it may become desirable to distinguish between the ploidy of a species or variety as it presently breeds and that of an ancestor |
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| Some studies suggest that selection is more likely to favor diploidy in host species and haploidy in parasite species | Bar Harbor, Maine: The Jackson Laboratory |
| Specific terms are triploid 3 sets , tetraploid 4 sets , pentaploid 5 sets , hexaploid 6 sets , heptaploid or septaploid 7 sets , octoploid 8 sets , nonaploid 9 sets , decaploid 10 sets , undecaploid 11 sets , dodecaploid 12 sets , tridecaploid 13 sets , tetradecaploid 14 sets , etc | The term monoploid is often used as a less ambiguous way to describe a single set of chromosomes; by this second definition, haploid and monoploid are identical and can be used interchangeably |
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| Dihaploids which are diploid are important for selective breeding of tetraploid crop plants notably potatoes , because selection is faster with diploids than with tetraploids | Glossary of Genetics and Cytogenetics: Classical and Molecular 4th ed |
An alternative usage defines "haploid" as having a single copy of each chromosome — that is, one and only one set of chromosomes.
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