At this stage, the chromosomes reach their maximum spiral, shorten and are located in the equatorial region of the cell. At the very end of the metaphase and the beginning of anaphase, duplication of the centromeres occurs. Next content: Chemistry of Life

Not only ecologists, but authorities and every citizen must be aware of the dangers of pollution that endanger life on planet Earth. Garbage In the beginning of human history, the garbage produced was basically made up of leaves, fruits, plant branches, feces and other residues of humans and other animals.

There are cases where alleles of one gene inhibit the action of alleles of another pair, which may or may not be on the same chromosome. This phenomenon is called epistasis (from the Greek epi, over, and stasis, arrest, inhibition). The gene that exerts the inhibitory action is called epistatic, and the gene that is inhibited is called hypostatic.

It has striated myocytes with one or two central nuclei. This tissue occurs only in the heart and presents contraction independent of the individual's will (involuntary contraction). In the heart muscle this contraction is vigorous and rhythmic. These muscle cells are smaller and branched, intimately joined together by specialized and typical structures of the cardiac musculature: the intercalated discs, which make the electrical connection between all the heart cells.

Gametogenesis is the process by which gametes are produced in organisms endowed with sexual reproduction. In animals, gametogenesis occurs in the gonads, organs that also produce sex hormones, which determine the characteristics that differentiate males from females. The fundamental event of gametogenesis is meiosis, which halves the amount of cell chromosomes, resulting in haploid cells.

Notice the figure below that shows the passage from adolescent to adult woman. Some of the changes in this passage are breast enlargement and the appearance of pubic hair and underarm hair. These are some of the secondary female sexual characteristics. Before we talk about the interior of the female body, let's talk about the outside, through which the woman receives stimuli and relates to the environment.