Essay Meiosis Questions Mitosis

Submitted By ehden101
Words: 770
Pages: 4

It is unlikely to find all of the structures within a cell because many of them do not happen all in one phase. One example is the cleavage furrow. This only happens during telophase. Also, these images are super small, and thus, may be difficult to located. In Both structures of the cells, the 2n number is 4. The purpose of mitosis, otherwise known as Cell or Nuclear division, is cell regeneration, growth, and asexual reproduction,while the purpose of meiosis is the production of gametes for sexual reproduction. Mitosis is a single nuclear division that results in two nuclei that are usually partitioned into two new daughter cells. One such cell is blastula, or an animal embryo at the early stage of development when it is a hollow ball of cells. There are various differences in how mitosis works with animals and plants cells. In Prophase, animal cells have centrioles that organize spindles while plant cells don't.
During Prometaphase, the pre­prophase band of plant cells disappears.
During Telophase, animal cells have a cleavage furrow, which is made of actin and myosin, that forms halfway between the two nuclei in the dividing cell. In Plant cells, a phragmoplast, which is made of actin, myosin, and microtubules, forms in the center of the cell where the cell wall will appear.
In Cytokinesis, the contractile ring in animal cells contracts and pinches the cell into 2 daughter cells. In plants, the phragmoplast extends and forms the cell wall.
In plants, mitosis occurs only in the meristem tissues. They are located at the tips of roots, shoots, and in the stem, between the xylem and phloem. In an onion root tip, there tends to be more mitotic division because this region is always growing and cell division is needed to support this growth. Also, while the root pushes through the soil, cells are scraped off and must be replaced.

The nucleus in the undivided cell has the diploid (2n) number of chromosomes, and the nuclei in the two split cells also have 4 number of chromosomes. In mitosis, the chromosome number halves. Exercise 2: Meiosis in Animals

A. There are a greater number of gametes in testes than in ovaries because during sexual reproduction lots of sperm cells, male gametes, flow from the male to the female reproductive organ. Many of the sperm die before they reach the ovary. Only one ovary is needed every cycle, but many sperm cells are needed in order to make sure that at least one will be fertilised during reproduction.

Exercise 3: Simulating Meiosis Questions Mitosis produces two genetically equivalent nuclei.
Mitosis occurs in response to the body's need for growth and repair. Generally, it occurs in all tissues except mature nerve tissue and in the formation of gametes.
Experiment Mitosis and Meiosis Meiosis the process of cell division that reduces the number of chromosomes in a cell from a diploid cell (2n) to haploid (n) and results in gametes (sex cells, aka eggs and sperm) and…