The present models presented in Figure 3 served whilst the foundation for developing brand new theory models.
Spermatogenesis ( Figure 3A ): Spermatocytes produce 4 spermatids, 2 of that have X intercourse chromosome plus the other 2 spermatids have actually Y sex chromosome. Just 2 associated with the 4 spermatids be involved in genetic recombination during meiosis we.
Oogenesis ( Figure 3B ): Given that 4 gametes aren’t differentiated, the assumption is that any 2 gametes could form 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 utilizing the X intercourse chromosome to make the zygote. The intercourse for the offspring is determined centered on whether or not the spermatozoon because of the X or Y chromosome unites with all the X intercourse chromosome within the ovum to create the zygote; leading to feminine (XX) or(XY that is male offspring. 4,6