Doctors in Brazil discover and confirm that a woman has blood with male chromosomes, a rare case of human chimerism.

A video of an oddly colored cat is causing a stir online as people debate whether its strange, patchwork coloration is just another type of calico cat or whether it is indicative of an even more rare ...

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Male yellow crazy ants (Anoplolepis gracilipes) are chimeras of two separate genetic lineages, researchers report in a study that reveals a unique mode of reproduction in this species – one previously ...

Most male yellow crazy ants have two distinct sets of DNA in their bodies, a new study published last week in Science finds. The ants display a genetic condition called chimerism, named for the ...

The yellow crazy ant, or Anoplolepis gracilipes, has the infamous distinction of being among the worst invasive species in the world. However, this is not the reason for which this particular ant is ...

A baby boy born in Washington last year is his own cousin, geneticists found. The child’s father is a genetic chimera—a person who carries two sets of DNA. After failing several paternity tests, the ...