My friends call me Ape Jaw Evan. Click here to read about me and other media myths, frauds, and lies. The Theory of Evolution is not a scientific law or a law of biology.
Genetic diversity and Population genetics An individual organism's phenotype results from both its genotype and the influence from the environment it has lived in.
A substantial part of the phenotypic variation in a population is caused by genotypic variation. The frequency of one particular allele will become more or less prevalent relative to other forms of that gene. Variation disappears when a new allele reaches the point of fixation —when it either disappears from the population or replaces the ancestral allele entirely.
Before the discovery of Mendelian genetics, one common hypothesis was blending inheritance. But with blending inheritance, genetic variance would be rapidly lost, making evolution by natural selection implausible. The Hardy—Weinberg principle provides the solution to how variation is maintained in a population with Mendelian inheritance.
The frequencies of alleles variations in a gene will remain constant in the absence of selection, mutation, migration and genetic drift. Despite the constant introduction of new variation through mutation and gene flow, most of the genome of a species is identical in all individuals of that species.
Mutation Duplication of part of a chromosome Mutations are changes in the DNA sequence of a cell's genome. When mutations occur, they may alter the product of a geneor prevent the gene from functioning, or have no effect.
This process is easier once a gene has been duplicated because it increases the redundancy of the system; one gene in the pair can acquire a new function while the other copy continues to perform its original function.
Sexual reproductionGenetic recombinationand Evolution of sexual reproduction In asexual organisms, genes are inherited together, or linked, as they cannot mix with genes of other organisms during reproduction.
In contrast, the offspring of sexual organisms contain random mixtures of their parents' chromosomes that are produced through independent assortment. In a related process called homologous recombinationsexual organisms exchange DNA between two matching chromosomes.
If each individual were to contribute to the same number of offspring twoa the sexual population remains the same size each generation, where the b Asexual reproduction population doubles in size each generation.
The two-fold cost of sex was first described by John Maynard Smith.
This cost does not apply to hermaphroditic species, like most plants and many invertebrates. The Red Queen hypothesis has been used to explain the significance of sexual reproduction as a means to enable continual evolution and adaptation in response to coevolution with other species in an ever-changing environment.
Gene flow Gene flow is the exchange of genes between populations and between species. Gene flow can be caused by the movement of individuals between separate populations of organisms, as might be caused by the movement of mice between inland and coastal populations, or the movement of pollen between heavy-metal-tolerant and heavy-metal-sensitive populations of grasses.
Gene transfer between species includes the formation of hybrid organisms and horizontal gene transfer. Horizontal gene transfer is the transfer of genetic material from one organism to another organism that is not its offspring; this is most common among bacteria.
It is possible that eukaryotes themselves originated from horizontal gene transfers between bacteria and archaea.Scientific Facts Proving Charles Darwin's Theory of Evolution is Wrong, False, and Impossible.
News You Can Use. Hi, my name is Evolutionary Fraud from Piltdown, England. It is by turns aloof and affectionate, serene and savage, endearing and exasperating. Despite its mercurial nature, however, the house cat is the most popular pet in the world. A third of American households have feline members, and more than million cats live among humans worldwide.
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Among the most cited evidence for human evolution is the existence of vestigial structures, body parts that seemingly have no leslutinsduphoenix.coms they once did, but somewhere along the way they lost their functions and are now basically useless.
Cats have developed a wide range of coat colours – under natural conditions these are adaptations to allow the cat to be camouflaged and assist its hunting lifestyle. Evolution and adaptation of Felis catus.
Co-existence of cats and humans is evident from fossil records from early human settlements, although these have been assumed to be wild . Cats have had a special bond with humans and have been domesticated since ancient Egyptian times.
In fact, they were even regarded as gods in these times and treated with the utmost care and respect.