The current models presented in Figure 3 served once the foundation for developing brand new theory models.
Spermatogenesis ( Figure 3A ): Spermatocytes bring about 4 spermatids, 2 of that have X intercourse chromosome while the other 2 spermatids have actually Y intercourse chromosome. Just 2 regarding the 4 spermatids take part in genetic recombination during meiosis we.
Oogenesis ( Figure 3B ): Due to the fact 4 gametes aren’t differentiated, the assumption is that any 2 gametes can develop the oocyte that is secondary in an ovum with just one X chromosome.
Fertilization ( Figure 3C ): During fertilization, some of the 4 haploid spermatozoa can penetrate the ovum and fuse aided by the X intercourse chromosome to make the zygote. The sex associated with the offspring is set according to if the spermatozoon with all the X or Y chromosome unites because of the X intercourse chromosome into the ovum to make the zygote; causing feminine (XX) or male (XY) offspring. 4,6
The mobile biology types of spermatogenesis, oogenesis, and fertilization had been simulated after differentiating intercourse chromosomes as ancestral and parental when you look at the model that is new Figure 4 ).