作者: Anna Bratu
DOI: 10.5772/36274
关键词: Regulator gene 、 Vertebrate 、 Embryo 、 Embryogenesis 、 Phylum 、 Evolutionary biology 、 Somatic cell 、 DM domain 、 Gene 、 Anatomy 、 Biology
摘要: Sex determination occurs during embryo development in Metazoans that appear as two morphologically distinct sexes. This means there is a precise time point embryogenesis when the initial signal starts to act and directs of ambiguous into male or female. What are these primary sex-determination signals? They different various vertebrates can be either genetically environmentally controlled. Once they appear, activate cascade genes respond signals regulate downstream sex-developmental events. Besides existence sexes, which virtually universal animal kingdom, strategies (both regulatory genes) vary between phyla opposite somatic-development strategies, have been found more conservative.