Zoology Essay

Gametogenesis begins in the seminiferous tubules of the testis, in human males. Meiosis begins with a diploid cell, spermatogonium, which divides through mitosis. The spermatogonia accumulate cytoplasm and replicate DNA. They are then called primary spermatocytes. In meiosis I, the primary spermatocytes’ chromosomes undergo synapsis, in which homologous pairs of chromosomes find each other, during Prophase I. Crossing over also takes place during Prophase I. In Metaphase I, independent assortment happens as chromosome pairs line up side by side randomly at the equator of the...