P1: Explain just how sperm and ova will be formed simply by producing an annotated diagram of meiosis and talking about what happens in ogenesis and spermatogenesis
In the male, meiosis precedes love-making cell difference. A single spermatogonium enters the first meiotic division as being a primary spermatocyte. This division produces two secondary spermatocytes, each of which divides to create two haploid spermatids. Each spermatid after that differentiates (by a process known as spermiogenesis) into a spermatozoon by elaboration of structural and functional specialisations that allow the ejaculate to fertilize the egg. Consequently, several haploid ejaculate result from each diploid spermatogonium. Sperm produced in the testicles are premature and not incredibly motile. Because the ejaculation make their journey through the tightly coiled epididymis, that they mature and become motile.
In relation to the diagram of spermatogenesis, every single human Spermatogonium (germ originate cell) gives rise to many Spermatogonia by mitosis. So the number of chromosomes in every Spermatogonium cell is definitely conserved by 46 chromosomes. Each Spermatogonium will in that case grow and develop into a Spermatocyte I that may duplicate its DNA in order that each of its 46 chromosomes will have two chromatids per each chromosome at the conclusion of the progress stage. Each Spermatocyte I will split by Meiosis My spouse and i (reductional meiosis) to give rise to two haploid. http://www.scienceaid.co.uk/biology/genetics/reproduction.html
Spermatocyte II each having 23 chromosomes and each chromosome is made up of two chromatids. Each Spermatocyte II will then separate by Meiosis 2 (equational meiosis) to give rise to two Spermatids. Each spermatid could have 23 chromosomes but the volume of chromatids every chromosome is definitely ONE. Since the Spermatid only within shape and does not divide to produce a Sperm, the number of chromosomes and chromatids will remain the same as in the spermatid. The sperm will have twenty three chromosomes (one chromatid per each chromosome).
Just like spermatogenesis,...