PHYSIOL 201 Lecture Notes - Lecture 33: Male Reproductive System, Gonad, Phagocytosis
Document Summary
Reproduction is about the survival of the species, not the individual. Homologous chromosomes line up in independent assortment, causing 8 million different combinations. Second meiotic division: separates sister chromatids creating haploid cells. During development of the fetus, initially, the sexual organs are indeterminate. Up to the genes which structure will develop. The primitive gonad is neither testes or ovaries at this point. The wolffian duct are what mature into the male reproductive structures. The mullerian duct develop into the female structures. )t"s the expression of a gene on the y chromosome that will have the major part in. This gene"s product will stimulate the primitive gonad to become the testes determining which reproductive organs develop. Around 7-8 weeks, in an xy fetus, there is this expression of a gene called the sry gene (sex determinant region of y) The development of the testes will cause it to release hormones after it is developed.
