Current Competing Theories Of The Origin Of Life On Earth: It Arrived From An Extraterrestrial Source; It Originated As A Heterotrophy; It Originated As An Autotrophy

862 words - 4 pages

Genetic diversity is always changing both across space and through time. Typically, the amount and type of genetic diversity within a species vary across its natural range. Additionally, its genetic diversity changes over time. At least in the long-term, and sometimes even over shorter time frames such as a few generations of the species. These natural changes in the genetic diversity of a species create a dynamic landscape upon which any influences that we exert are superimposed. To better understand our impacts, and to decide if management actions are warranted, it is useful to understand the natural dynamics of genetic diversity. Genetic diversity is affected by several ongoing natural ...view middle of the document...

Genetic mutations cause permanent changes in a DNA sequence that makes up a gene, according to Medline Plus. Mutations can range in size, varying from a single DNA block to a large segment of a chromosome. Individuals inherit genetic mutations from parents or develop them during their lifetime. Common mutation diseases include cystic fibrosis, hemophilia, color vision deficiency and Tay-Sachs disease.A common, inherited genetic disease known as cystic fibrosis affects mainly the Caucasian population of the United States, according to the Genetics Home Reference. The disease occurs in 1 out of 2,500 to 3,500 Caucasian newborns. Cystic fibrosis affects the mucus glands, causing progressive damage to the respiratory and digestive systems. A bleeding disorder, known as hemophilia slows the blood-clotting process. Hemophiliacs often experience prolonged bleeding after injury or surgery. Both major forms of hemophilia, A and B, occur more frequently in males. The more predominant form, hemophilia A, occurs in approximately 1 in 4,000 newborn males worldwide

To ensure the continuation of the species, plants and animals use two methods of reproduction - sexual and asexual. Sexual reproduction is the more common form of reproduction. It involves the fusing of two gametes, one from each partner to form a new being. Asexual reproduction doesn't require a second partner.
Vegetative reproduction is a form of asexual reproduction in plants, where parts of the plant fall off and develop into new plants.The main disadvantage of this form of reproduction is that the new plants will all grow very close to each other and to the parent. This will cause a struggle for soil, nutrients and light, and will...

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