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Well, to try to understand some facts that can happen to us or someone close to us, we need to know what the role of X and Y chromosomes in our lives. But what are chromosomes? Inside the cell nucleus filamentous networks are constituted of DNA, chromatin. Chromatin changes its form at the time of cell division, forming the chromosomes that carry the genetic information for each individual. Now that you know what are chromosomes, seeks to address: X or Y chromosome: Who decides what? All of us, men or women, come to the world from birth. However, several questions in disturbed for a long time: DEBATE Let's see what your class thinks about sex determination. Organize into groups and raise arguments. What factors were crucial in defining our sex? In that time our sex was defined? For centuries sought to answer these questions. Earlier, as he had absolutely no knowledge of the mechanisms that determine the sex of an individual, it was assumed that sex was already predetermined in gamete, regardless of fertilization, with sperm inside a "miniature of man" (homunculus). Homunculus within a spermatozoon. Source: Illustration of Katie Suyama. To learn more about this subject, you can read the Sheets Embryos: the fantastic work in progress! As this process?, This Textbook audience. Biological Mechanisms
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Pa, pokušati shvatiti neke činjenice koje se mogu dogoditi na nas ili netko blizak nama, moramo znati što je uloga X i Y kromosoma u našim životima. No, ono što se kromosomi? Unutar stanične jezgre nitaste mreže sastoje se od DNA, kromatina. Kromatina mijenja svoju formu u vrijeme diobe stanica, tvoreći kromosome koji nose genetske informacije za svakog pojedinca. Sada kad znate što su kromosomi, nastoji riješiti: X ili Y kromosom: Tko odlučuje što? Svi mi, muškarci ili žene, dolaze na svijet od rođenja. Međutim, nekoliko pitanja u poremećena za dugo vremena: DEBATA Idemo vidjeti što vaš razred misli o određivanje spola. Organizirati u skupine i podizanje argumente. Koji su čimbenici bili su ključni u definiranju naš seks? U to vrijeme naš seksualni bio definiran? Već stoljećima nastojali odgovoriti na ta pitanja. Ranije, dok je imao apsolutno nikakvog znanja o mehanizmima koji određuju spol pojedinca, pretpostavljeno je da je seks već je predodređeno u spolne stanice, bez obzira oplodnjom, spermom unutar "malom čovjeku" (homunculus). Homunculus unutar oplodna glava. Izvor: Ilustracija Katie Suyama. Da biste saznali više o ovoj temi, možete pročitati listove Embriji: fantastičan posao u tijeku! Kao što je ovaj proces?, Ovaj udžbenik publike.