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Yellow crazy ant
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==Reproduction== Similar to other ants, the queen produces eggs which are fertilized by male sperm that are stored in sperm stores. When an egg is fertilized, there are three distinct events that can happen: (i) the resulting [[diploid]] organism develops into a queen if the egg is fertilized by an R sperm or (ii) into an infertile diploid worker if the egg is fertilized by a W sperm. However, a third outcome has been described in a 2023 scientific study: (iii) the egg is fertilized by a W sperm but the parental nuclei bypasses [[syngamy|the fusion of the two gametes]] and divide separately within the same egg, leading to a [[haploid]] male that is [[chimerism|chimeric]] with a portion of cells carrying the W genome and a portion of cells carrying the R genome.<ref name="Darras_etal">{{Cite journal|url=https://www.researchgate.net/publication/369856466|title=Obligate chimerism in male yellow crazy ants|first1=H.|last1=Darras|first2=C.|last2=Berney|first3=S.|last3=Hasin|first4=J.|last4=Drescher|first5=H.|last5=Feldhaar|first6=L.|last6=Keller|date=April 7, 2023|journal=Science|volume=380|issue=6640|pages=55β58|doi=10.1126/science.adf0419|pmid=37023182 |s2cid=257985666 }}</ref> Interestingly, not all tissues have equal proportions of each cell line, with sperm cells mostly carrying the W genome and thus providing the W alleles with a fitness advantage.<ref name="Darras_etal"/> This is the first known case of obligate [[chimerism]] in animals.<ref>{{Cite web|title=Yellow crazy ant males have two sets of DNA|url=https://phys.org/news/2023-04-yellow-crazy-ant-males-dna.html|author=Bob Yirka}}</ref><ref>{{Cite journal|url=https://www.nature.com/articles/d41586-023-01002-3|title=Crazy ants' strange genomes are a biological first|first=Ewen|last=Callaway|date=April 6, 2023|journal=Nature|via=www.nature.com|doi=10.1038/d41586-023-01002-3|pmid=37024590 |s2cid=258007429 |url-access=subscription}}</ref>
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