The prevailing models presented in Figure 3 served since the foundation for developing hypothesis that is new.
Spermatogenesis ( Figure 3A ): Spermatocytes bring about 4 spermatids, 2 of that have X intercourse chromosome plus the other 2 spermatids have Y intercourse chromosome. Just 2 of this 4 spermatids take part in genetic recombination during meiosis we.
Oogenesis ( Figure 3B ): whilst the 4 gametes aren’t differentiated, the assumption is that any 2 gametes can develop the oocyte that is secondary within an ovum with just one X chromosome.
Fertilization ( Figure 3C ): During fertilization, some of the 4 spermatozoa that are haploid penetrate the ovum and fuse using the X intercourse chromosome to make the zygote. The intercourse for the offspring is determined according to whether or not the spermatozoon using the X or Y chromosome unites using the X intercourse chromosome into the ovum to make the zygote; leading to feminine (XX) or male (XY) offspring. 4,6
The cellular biology types of spermatogenesis, oogenesis, and fertilization had been simulated after differentiating sex chromosomes as ancestral and parental when you look at the model that is new Figure 4 ). Read more