Sex Chromosomes Definition
Though those two chromosomes set with each other during meiosis, there is certainly often extremely minimal homology or recombination among them, mainly as a result of a big difference between their hereditary content and size. Usually one chromosome is smaller, and seems to retain just those genes which are essential for intercourse determination.
The appearance of distinctly different sex chromosomes, or heteromorphic sex chromosomes, is a relatively recent event in evolutionary timescales. The very first cases of sexual dimorphism, where male and female reproductive organs come in various people, are believed to own arisen through temperature-dependent intercourse dedication, where some genes are fired up or off with respect to the ambient heat. These genes bring about the outside male or feminine traits plus some types of lizards continue using this technique. As time passes, this can be expected to have developed to the operational system of various sex chromosomes. Continue Reading