These include the Amami spiny rat Tokudaia osimensis and the Tokunoshima spiny rat Tokudaia tokunoshimensis and Sorex araneusa shrew species. Westergaard M The relation between constitution and sex in the offspring in triploid Melandrium.
Sex portal. Some species, however, have no sex-determination system. Nitsch C Single cell culture of an haploid cell: the microspore. Transcription factors containing the DM domain are involved in sex determination in animals as different as nematodes, flies and mammals, but do not by themselves determine the sex.
Sex determination in the teleost fish O. Alexander MP Differential staining of aborted and nonaborted pollen. New England Journal of Medicine.
Sex determination in the dioecious Melandrium. After the mammals separated, the branch further split into Lepidosauria and Archosauromorpha. There are some reptiles, such as the boa constrictor and Komodo dragon that can reproduce both sexually and asexually, depending on whether a mate is available.
Main article: ZW sex-determination system. Haplodiploidy is found in insects belonging to Hymenopterasuch as ants and bees. Because of the absence of obvious sex-linked markers and heteromorphic sex chromosomes, pufferfish and zebrafish do not appear to be suitable for performing studies on genetic sex determination.
Issue Date : July