The final result of meiosis is haploid daughter cells that have 23 chromosomes each. These haploid daughter cells may act as gametes during sexual reproduction. This includes sperm and oocytes, which can later fuse together to form a zygote.
Meiosis is a process that occurs in sexually reproductive organisms. During meiosis, diploid cells come together to produce haploid cells, which may then go on to act as gametes. The aim is to share genetic information via chromosomes from the father and mother cells, leading to a new set of genes. When meiosis is complete, the daughter cell has 23 new chromosomes, which are formed from one member of a pair from the mother and father cells. This process is known as spermatogenesis in males and oogenesis in females. In addition to producing four gametes in males and one in females, meiosis allows for genetic diversity amongst organisms.
Meiosis is able to achieve genetic variation in several ways. During prophase one, chromosomes cross over. By metaphase one, they begin to independently align themselves to form new chromosomes that are unique to the daughter cell. Not only are the gametes genetically unique, they also give rise to genetically unique zygotes when they fuse with other gametes.Learn More
The zona pellucida is the transparent, thick outer layer of the ovum in mammals that protects the cell as it travels from the ovary to the uterus. The National Institutes of Health states the layer regulates interactions between ovulated eggs and free-floating sperm as the egg is fertilized. In order to fertilize the egg, sperm must penetrate this outer layer as it thins on the way to the uterus.Full Answer >
Cell division, also called mitosis, occurs in multicellular organisms to create tissues, organs and organ systems. It is a method of asexual reproduction in unicellular organisms, and it occurs because it’s essential for increasing the population of the organisms.Full Answer >
Human skin cells contain 46 chromosomes, or 23 chromosome pairs, and after mitosis, the two daughter cells also have 46 chromosomes. Mitosis is a cellular process that creates two identical daughter cells from one original cell.Full Answer >
The consensus among biochemists is that virtually every cell in the human body can break down sugar, usually in the form of glucose, to use as energy. According to the authors of the 5th edition of "Biochemistry," the brain and the kidneys prefer to run on glucose. In fact, the brain favors glucose to such an extent that it only metabolizes other fuel sources after several days of starvation.Full Answer >