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Which process produces the most variation within a species?
Variations occurs in species due to the process of "Crossing over"
Why is variation essential for evolution?
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.
Which type of reproduction results in the greatest amount of genetic variation?
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.
What would not be considered as one of the steps in the evolutionary process?
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)
What must exist in a population before natural selection can act?
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.
What causes variation within species?
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.
What is variation among members of the same species called?
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.
How does meiosis create variation?
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.
What is the adaptive value of the process of crossing over as a source of variation in a species?
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.
What kind of impact does crossing over create in genetic variation during meiosis?
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.
What species that lacks variation is able to adapt to a changing environment?
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.
How does genetic variation prevent extinction of a species?
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.
Explain why there is more variation between a species than within a species?
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.
How does natural selection produce genetic variation within a 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.
How does genetic recombination influence how species change over time?
The genetic variation introduced during recombination provides new allelic combinations for natural selection to act upon.
Which two factors provide the genetic basis for variation within a species?
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)
Why are people diverse and why is there variation among species?
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.
