Meiosis Cell Cycle

Genes are what parent passes on to their off spring. The reason that the off spring don’t look identical to the parent is due to a process called crossing over during meiosis.. Meiosis creates new cells that contain different data than that of the parent due to the genes getting shuffled around by cross linking. The chromatids which are parts of the chromosome cross over bits of data making the new cell unique from the parental chromosome. Dividing this way will ensure that the genes will be randomly selected and different from the parent chromosomes, which will then be passed on to the off spring. Cross linking provides more variation in the populations gene pole . Gametes are produced through this cell division process .There are 8 stages …show more content…
Phase two is Metaphase I, where Tetrads begin to line up in the middle of the cell. And the spindles have now fully formed. During prophase I and metaphase I, genetic recombination occurs. Phase three, is Anaphase I in which Tetrads separate and two chromatids move toward opposite poles of the cell. Phase four, is Telophase I where the two chromatids decondense and nuclear membranes reforms around them. Cytokinesis then takes place forming two daughter cells, each nucleus is now haploid. Now each daughter cell has two chromatids that are needed to be reduced to one, each is them to be able to continue to develop into gametes, these are then sorted in stage II of meiosis starting with Prophase II. The two chromatids are now visible as they condense with the spindles beginning to form. Secondly, there is a Metaphase II which is when the chromosomes line up in the middle of the cell, at this point the spindle is fully formed. Later there is the Anaphase II stage, here the chromosomes pull apart with only one chromatid remaining at each pole. And, the final phase is Telophase II, here the single chromatid decondense and the nuclear membrane farms around them, there are now four daughter cells which are all haploids from which the sperms and eggs are now ready to develop …show more content…
When an organism produces more healthy offspring than another of the same species, the gene from the more successful organism will become the dominant gene with the recessive genotype becoming extinct from the population. Species adapt to their environment over time, creating new species along the way a great way to see this clearly is Darwin’s theory on finches. Where Darwin discovered that on a group islands called the Galapagos islands there were lots of types of finches that all looked slightly different, with different shaped beaks, ,bodies, some had the ability to fly some did not. This was due to the fact that the islands were too far apart for the finches to fly to another island so all the different populations became distinct. And because each island had different food sources each finch population evolved to be able to survive easily on the food