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Those with both sterility versions are completely sterile, cannot reproduce, and, thus, die out.The single-sex plants breed not only with one another but also with hermaphroditic plants and pass on the mutation, which can result in single-sex offspring.(Sterile plants also can result, but plants with genes that favor the production of fertile offspring will be more successful.) When inbreeding depression in hermaphrodites is also considered, Ashman said, a gradual decline in the number of hermaphroditic plants is to be expected.Consequently, fewer chromosomes with both fertility versions of the loci will be passed on and the frequency of single-sex individuals will increase. "Two From One: Evolution Of Genders From Hermaphroditic Ancestors Mapped Out." Science Daily. In butterflies, sex is determined by chromosome differences.Research from the University of Pittsburgh published in the Nov.

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Note: Exclusive Technology Tour only between 1st of March and October 31.For the current study, Ashman and Pitt postdoctoral research associate Rachel Spigler worked with a wild strawberry species in which the evolution of separate sexes is not complete, so hermaphrodites exist among male and female plants.