Genes that were historically advantageous can become detrimental in the modern world. Diabetes is an example of this. Foods that were eaten historically were in short enough supply that gorging on them for our ancestors was no problem, but today, with food surpluses in the developed world, these foods present a problem to the genetic mediated digestion/storage of these foods. So, selection has not eliminated these genes and for two reasons. The first being that there has not been enough time and the second, and much more likely reason, is that these new deleterious effects do not affect reproductive success as these things are often late onset traits.
The one gene-one polypeptide theory states that for every gene one protein is synthesized n a cell. This theory has lost favor with the discoveries of post-translational modification, protein splicing and epigenetics, all of which support the production of multiple protein products from a single gene.
The thrifty gene hypothesis suggests that certain individuals may have inherited genes that predispose them to efficiently storing fat as a survival mechanism during times of food scarcity. This theory proposes that individuals with these genetic traits may be more likely to store excess calories as fat, leading to weight gain and difficulty losing weight.
One idea that follows the Dobzhansky-Mayer theory of speciation is the concept of reproductive isolation, where barriers prevent gene flow between populations leading to the formation of new species. This theory suggests that genetic changes, such as mutations and natural selection, drive the process of speciation by creating differences in traits that accumulate over time.
Ultimately, Gregor Mendel's statistical approaches to genes, which he called factors, led DeVires, Morgan and other at the turn of the 20th century to develop a theory that explained the workings of genes.
population
The two theories of evolution in a eukaryotic cell are endosymbiotic theory and gene duplication. Endosymbiotic theory suggests that eukaryotic cells evolved from a symbiotic relationship between different prokaryotic organisms. Gene duplication theory suggests that gene duplication events have played a significant role in the evolutionary development of new functions and complexity in eukaryotic cells.
The Time Cube theory proposed by Gene Ray suggests that time is divided into four simultaneous days, each with its own unique characteristics. However, the theory is widely considered to be pseudoscience and lacks empirical evidence to support its claims.
The one gene-one polypeptide theory states that for every gene one protein is synthesized n a cell. This theory has lost favor with the discoveries of post-translational modification, protein splicing and epigenetics, all of which support the production of multiple protein products from a single gene.
The thrifty gene hypothesis suggests that certain individuals may have inherited genes that predispose them to efficiently storing fat as a survival mechanism during times of food scarcity. This theory proposes that individuals with these genetic traits may be more likely to store excess calories as fat, leading to weight gain and difficulty losing weight.
Game theory was used to describe social altuism by Richard Dawkins in his book "The Blind Watchmaker" and "Selfish Gene". He suggests that an altruistic act will promote the survival of the altruistic individuals genes.
No. The word thrifty is an adjective. The adverb form is "thriftily" (an a thrifty manner).
My dad was a thrifty spender. He was known for being thrifty.
This theory suggests artwork is successful if it realistically imitates something from life.
Thrifty means frugal. A thrifty person looks for sales and is careful about how he or she spends money.
The noun form of the adjective thrifty is thriftiness.The word thrifty is the adjective form of the noun thrift.
Douglas Gene Arner has written: 'Perception, reason & knowledge' -- subject(s): Collections, Knowledge, Theory of, Theory of Knowledge
gene theory