New species evolve from a previous existing species. As challenges arrive in the environment of the old species over many many generations body features are lost and/or gained. Eventually the old species will either eventually die out or change habitats. So basic evolution.
Variations occurs in species due to the process of "Crossing over"
For one, without genetic variation, a species is more likely to face significant danger from disease. In humans there are some diseases that affect a few races more than others, but because of genetic variations, our species as a whole is more likely to adapt to new diseases and survive rather than if everybody had the same predisposition toward a disease.
That would be sexual reproduction. Sexual reproduction allows for independent assortment and crossing over to occur. This is fancy language for the genetic material gets mixed up a lot. Since the genetic material gets mixed up, variation will result.
Random mutations and genetic rearrangements occur.Natural selection acts on the genetic variation present in a population.Inheritable characteristics are produced by random genetic events such as mutation.Allele frequencies in a population change over time.none of the above (This is the correct answer)
Competition + Variation. Classic example: Giraffes not always had long necks. There were variation in the species. When food sauces grew low competition increases and those with longer necks survived (more fruit/food at the top of trees) as they were more suited to the conditions. These long necked giraffes then breed and the offspring have long necks, thus natural selection of a "fitter" species. Hense - survival of the fittest.
because the variation causes the variation becasue of the variation of the species. genetic mutation and adaption of some members to physical condition better than others (survival and reproduction of those best able to adapt to the environment. ) It can also be affected by the contact the species has doesn't have with other populations of the species.
Variation among members of the same species is called genetic diversity. This diversity arises from differences in genetic makeup, leading to variations in traits such as physical appearance, behavior, and susceptibility to diseases. Genetic diversity is important for a species' ability to adapt to changing environments and to evolve over time.
Meiosis creates genetic variation through the production of 4 haploid daughter cells, each with random genetic combinations. Meiosis also creates genetic variation through the process called crossing over, where chromosome segments are exchanged.
The process of crossing over during meiosis increases genetic variation within a species by shuffling genetic material between homologous chromosomes. This genetic diversity enhances the ability of a species to adapt to changing environments and increases the likelihood of beneficial traits being passed on to offspring. Ultimately, this can improve the species' chances for survival and successful reproduction.
Crossing over during meiosis creates genetic variation by exchanging genetic material between homologous chromosomes, leading to new combinations of genes in offspring. This increases genetic diversity and can result in unique traits in individuals.
A species that lacks genetic variation but can still adapt to a changing environment is the Antarctic icefish. This species has limited genetic diversity, but it has unique physiological adaptations that allow it to survive in the extreme cold conditions of the Antarctic waters.
Genetic variation allows individuals within a species to have different traits that might be advantageous in changing environmental conditions. This diversity increases the chances that some individuals will survive and reproduce when faced with new threats or challenges, helping to prevent extinction. High genetic variation also provides a larger pool of traits for natural selection to act upon, promoting the species' ability to adapt over time.
Between-species variation arises from differences in genetic makeup, adaptations to specific environments, and evolutionary history, leading to distinct characteristics and behaviors. Within-species variation is typically smaller as individuals share a more recent common ancestor, resulting in fewer genetic differences and a narrower range of traits. The accumulation of genetic mutations and selection pressures over time contribute to the greater divergence observed between species.
It's mainly mutations in the DNA and recombination of chromosomes that produce the genetic variation. Natural selection then favors those changes that give rise to greater reproductive success.
The genetic variation introduced during recombination provides new allelic combinations for natural selection to act upon.
mutations and sexual reproduction (due to random orientation of bivalents about the equatorial spindle during metaphase I and pairs of chromatids during metaphase II; fusion of male and females gametes during fertilization; and reciprocal crossing over)
People are diverse due to a combination of genetic differences inherited from ancestors and environmental influences. Variation among species arises through evolutionary processes such as natural selection, genetic drift, and mutations, which drive adaptation to the environment and lead to the development of different traits over time.