Dating a hermaphrodite
Such genes would be candidates for the female suppressor involved in the early stages of sex chromosome evolution in this species. 2014), and the genes involved in their initial evolution cannot be identified, because many subsequent changes, including gene gains and losses, have occurred (Hughes et al. Here, we describe complete sequencing of the AU9 MSY.
The sex chromosomes in other organisms, such as mammals, are ancient (Veyrunes et al. Moreover, sequencing multiple individuals of both males and hermaphrodites is necessary, because the origin or origins of hermaphrodites are unknown, and the AU9 MSY might not be closely related to the ancestor of the HSY, as we indeed show to be the case.
AU9 was collected from a papaya breeding program at Griffith University in Queensland, Australia, which was traced back to a papaya breeding program in Israel with plants of unknown origin.
William Storey (1976) wrote, “Since dioecism seems to be the evolutionary norm in Caricaceae, it is possible that ambisexual forms owe their continued existence to human selection.” This hypothesis was previously rejected after analysis of a pair of X- and Y-specific bacterial artificial chromosomes (BACs) from an improved (but not cultivated) dioecious variety, AU9, and their homologous BAC from the gynodioecious cultivar Sun Up.
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