Scientific Research Publishing

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=50703#.VEmeuFfHRK0 Author(s) Antonina V. Trukhina , Aleksandr F. Smirnov Affiliation(s) Department of Genetics and Biotechnology, St. Petersburg State University, St. Petersburg, Russia . ABSTRACT Sex determination system in birds is characterized by a homo-(Neognatae) and heteromorphic ( Paleognatae ) sex chromosomes. Heterogametic sex is female (ZZ/ZW system). DMRT 1 gene is a gene regarded as a main male sex determining factor in this group of animals. The question remains about the participation of other factors (HEMOGEN, AMH etc.) in appearance of testis, and the role of steroid hormones in formation of ovaries. Complete sex ...

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=50542#.VECQvVfHRK1 Author(s)      Simona Sanvito 1,2 , Anna Fabiani 1,3 , Filippo Galimberti 1 Affiliation(s) 1 Elephant Seal Research Group, Sea Lion Island, Falkland Islands . 2 Facultad de Ciencias Marinas, Universidad Autónoma de Baja California, Ensenada, México . 3 Dipartimento di Biologia, Università Degli Studi di Roma Tor Vergata, Roma, Italia . ABSTRACT The determination of sex by simple observation is often difficult in marine mammals, even in sexually dimorphic species. Moreover, there is often the practical necessity to determine sex in samples that have been collected without handling or observing the subjects. In these cases, a mo...