The prevailing models presented in Figure 3 served because the foundation for developing brand new hypothesis models.
Spermatogenesis ( Figure 3A ): Spermatocytes bring about 4 spermatids, 2 of that have X sex chromosome in addition to other 2 spermatids have actually Y intercourse chromosome. Just 2 associated with the 4 spermatids take part in genetic recombination during meiosis we.
Oogenesis ( Figure 3B ): since the 4 gametes are not differentiated, the assumption is that any 2 gametes could form the secondary oocyte ensuing in an ovum with only 1 X chromosome.
Fertilization ( Figure 3C ): During fertilization, some of the 4 haploid spermatozoa can penetrate the ovum and fuse with all the X intercourse chromosome to make the zygote. The intercourse associated with the offspring is decided centered on if the spermatozoon using the X or Y chromosome unites with all the X intercourse chromosome when you look at the ovum to create the zygote; leading to feminine (XX) or(XY that is male offspring. 4,6