BIOL 2160 Chapter : Chapter 22 Reproduction
Document Summary
Androgen is the umbrella term and androgen is the specific. Although males have more androgens and females have more estrogens and progesterone, Copulation = act of mating: sperm deposited into female to fertilize ovum. After fertilization = pregnancy or gestation: first two months: embryo, after two months: fetus, about nine months: partirition or birth. Chromosomes determine whether fetus develops ovaries or testes =sex determination. Y chromosome: sry gene (sex-determining region on y: if sry gene present testes, if sry gene absent ovaries, an embryo has generic gonads that can become either male or fem. Depending upon what happens in the 3rd and beyond week of development. First 2 weeks: embryo sexually indifferent: wolffian ducts (precursor to male tract, mullerian ducts (precursor to female tract, the body gives the embryo every chance to become male, once it doesn"t happen, the default sex is female. If anything goes wrong with male stuff, it makes a female.
