Cell growth and reproduction is guided by the genetic code present in the DNA strands of the cell. These DNA strands form genes, which are packaged in chromosomesKnow More
Reproduction can be either sexual or asexual. In asexual reproduction, a single set of genetic information is replicated in an identical cell. The first step is the copying of a second set of chromosomes identical to the first in the cell nucleus. These two set then latch onto opposing sides of the cell. The cell membrane on these opposing sides continues to constrict until the cell is cleaved down the middle. This method of reproduction produces an offspring that is a perfect clone of the organism. It is the only means of reproduction in single-celled organisms. Some multicellular organisms, such as starfish, can also reproduce this way.
Sexual reproduction results from the joining of two specialized reproductive cells, such as sperm and ova. The advantage of this form of reproduction is that it introduces a larger pool of genetic diversity, as the offspring has two sets of DNA instead of the single set that is copied in asexual reproduction. Reproduction through sexual means involves the cells undergoing a complex replication and division process called mitosis.Learn more about Cells
Cell division is limited by a process called cellular senescence, during which cells in culture divide more slowly before stopping entirely. The cells do not necessarily die during senescence, but they no longer replicate.Full Answer >
Cell differentiation describes the process by which a cell is destined to become a particular type of cell, according to the Department of Biology at Kenyon College. The zygote is a cell formed from the union of sperm and an egg and is considered totipotent, meaning it can develop into any type of cell in the body. The first few cell divisions from this zygote are also totipotent.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 >
Cell theory was developed in the early 19th century by three German scientists, Theodor Schwann, Matthias Jacob Schleiden and Rudolf Virchow. While all three scientists contributed to the generally accepted classical cell theory, each hypothesized different sections of it and had parts of their theory refuted and replaced.Full Answer >