BIOL 200 Lecture Notes - Lecture 5: Secondary Sex Characteristic, Barr Body, Autosome
Document Summary
-bc male and females differ at the 23rd pair, some really interesting genetics happen there. We typically call these two types : male and. Female: from a biological/genetic standpoint, we only distinguish these two types by a single criterion. Different organisms do this differently, but we refer to them as sex determination: most sex determination is done by chromosomal sex- Determining systems: in 1891, one scientist saw some weird thing insect nuclei. Since it was weird and he had no idea what it was, he called it the x body . Later, it was determined that this thing was a special sex-determining chromosome and so it was referred to as the x chromosome. Many years later, when another tiny little chromosome was found only in mammalian males it was given the name that comes after x which is y: there are a number of different chromosomal sex- determining systems. We are most familiar with the xx-xy system (almost all mammals)
