Where is the intermediate mesoderm and how does it form? The Primary Organizer dorsalizes the mesoderm, resulting in dorsal mesoderm (gives rise to somites) and intermediate mesoderm (gives rise to kindey and gonad). Intermediate mesoderm is located between the paraxial mesoderm and the lateral plate. It develops paired epithelial thickenings. These paired epithelial thickenings are [...]

For most diploid species, sex is determined by one of the homologous pair of sex chromosomes. In humans and fruit flies, the sex chromosomes are X and Y (XX=female ; XY=male). In birds, female is WZ and male is ZZ. There are many ways of determining sex: Sex chromosome: humans, silkworms, drosophila, nematodes. Ploidy: bees, [...]