Meiosis I And Meiosis: Four Haploid Cell Processes

Meiosis is the process in which a diploid cell is divided into 4 haploid cells. Meiosis is separated into two parts meiosis I and meiosis II. In meiosis I, the first step is interphase and in this phase DNA is replicated. For example, in the diagram the DNA of big A, small a, big B, small b will all be replicated. This will create a doubling of the DNA that existed and will later be condensed into chromosomes. After interphase, prophase I occurs; in prophase I the replicated chromosomes pair up with their homologous pairs and this creates a tetrad that is formed by the sister chromatids. The sister chromatids were the homologous chromosomes before being paired up. In reference of the last example, the replicated big A will pair up with the …show more content…
During meiosis II many of the processes are very similar to the processes in meiosis I. In meiosis II, there is prophase II, metaphase II, anaphase II, telophase II and cytokinesis. In prophase II, the processes are very similar to the processes that occur in prophase I. However, in prophase II, the sister chromatids are still intact and crossing over does not occur. In metaphase II, the Law of Independent Assortment still applies during the line up of the sister chromatids. In anaphase II, a new law is introduced which is the Law of Segregation. The Law of Segregation states that each allele that is responsible for a certain trait is separated into their individual cells. For example, big A has an allele that is responsible for being tall, small a has an allele for being short, small b has an allele for blue eyes, and big B has an allele for brown eyes; these different chromosomes will be separated into different gametes. This process creates a genetic variance in inheritance. The last step in meiosis II is cytokinesis and this is when the two daughter cells from the end of meiosis I separates into four haploid cells that contains one chromosome which has an allele for a