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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.
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∙ 13y ago
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∙ 6y agowell they adapt combineing with other spices
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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?
Variation within species can be caused by genetic mutations, environmental factors, and interactions between genes and the environment. Genetic mutations are changes in the DNA sequence that can create new traits. Environmental factors, such as diet and climate, can also influence variation by selecting for certain traits over others.
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.
Why is crossing over so important?
It increases genetic variation in organisms
How does the environment influence populations of organisms over multiple generations?
Genetic variation describes naturally occurring genetic differences among individuals of the same species. This variation permits flexibility and survival of a population in the face of changing environmental circumstances. Genetic variation is often considered an advantage, as it is a form of preparation for what the unexpected could bring.
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.
What phase in meiosis increases genetic variation?
Crossing-over
How is genetic diversity beneficial a species?
Crossing over causes genetic diversity. If there was no genetic diversity in a species, the species would be prone to extinction.
How is genetic diversity to beneficial to a species?
Crossing over causes genetic diversity. If there was no genetic diversity in a species, the species would be prone to extinction.
How is genetic diversity beneficial to species?
Crossing over causes genetic diversity. If there was no genetic diversity in a species, the species would be prone to extinction.
What is a word with a special meaning in a area of study?
Specialization
During meiosis crossing-over gene exchange between chromosomes may occur Crossing-over usually results in?
The result of crossing over is genetic diversity. More specifically, it is a hybrid chromosome with a unique pattern of genetic material. Does this answer help?
What are two sources of genetic variation?
Natural and Artificial Selection
