0
Natural selection is the differential fitness of diverse phenotypes, causing some individuals to reproduce more than others according to their own relative fitness. Evolution is the change in gene frequencies of a population between generations. Therefore, natural selection can indeed occur without resulting in evolution, as changes in mean fitness do not necessarily lead to changes in gene frequencies.
For example, a deleterious allele may affect only homozygotes in a population. Thus, homozygotes may be selected against in equal proportions, causing them both to decrease in frequency at the same rate. While heterozygotes would have higher fitness, the mean change in frequencies would still equal zero. Both the dominant and recessive alleles are still present at the same frequency as before they were acted on by selection, due to the relative increase in heterozygotes.
What else can I help you with?
How does natural selection provide a mechanism for evolution to occur?
by having sexual intercourse with hoes and getting money
Can natural selection occur without variation in a population?
no there is no genetic variation for natural selection to act upon
Which of these is necessary for natural selection to occur genetic engeneering genetic variation asexual reproduction or enviormental stability?
Genetic variation is necessary for natural selection to occur. This variation provides the raw material for differential survival and reproduction, which drives the process of natural selection. Without genetic variation, there would be no differences for natural selection to act upon.
Natural selection acts directly on phenotype whereas evolution acts directly on?
Natural selection acts directly on phenotype, which refers to the observable traits of an organism. In contrast, evolution acts directly on the genetic makeup of populations over time, as changes in allele frequencies occur due to processes like natural selection, mutation, gene flow, and genetic drift. Thus, while natural selection influences which phenotypes are favored in a given environment, evolution encompasses the broader changes in genetic composition that drive the adaptation and diversification of species.
Is Genetic diversity is the raw material for evolution?
Mutations occur randomly, and every once in a blue moon, a mutation offers some benefit to a individual of a particular species in a particular place and allows that individual to have more offspring than its peers. If the mutation provides enough benefit to some individuals, they will have a tendency to survive and reproduce (as per the principle of natural selection). Natural selection reduces variability by killing off less fit individuals. It is mutations that increase the variability and allow evolution (successful natural selection, not mass extinction, but controlled deaths) to occur. Without variability there is no evolution.
What are the 4 mechanisms by which evolution can occur?
genetic drift, mutation, natural selection, and migration
Why does evolution evolution by natural selection can not occur if the variation in a characteristic does not contribute to differences in fitness?
Differential selection is just that, differential. Some variation is marginally superior to another variation us fitness difference, so the key is to have variation. Then natural selection will " see " this slight variation and select the better adapted trait against the background of the immediate environment.
How is genetic diversity important to the concept of natural selection?
Without genetic diversity, natural selection cannot occur
What are three reasons for natural selection to occur?
1. different breeding 2. evolution 3.adaptation
How does natural selection provide a mechanism for evolution to occur?
by having sexual intercourse with hoes and getting money
Can natural selection occur without variation in a population?
no there is no genetic variation for natural selection to act upon
Why is Lamark not called the father of Evolution?
Because it was Darwin who made it a scientifically plausible explanation, by providing a mechanism by which evolution could occur....Natural Selection.
Natural selection cannot occur without what?
Variations within a population. Variations mean traits that only certain individuals have that give the individual a greater or lesser chance of reproducing.
What does the unit of evolution depend on?
The unit of evolution depends on the level at which genetic variation is passed on to the next generation. This can occur at the level of individuals, populations, or species. The unit of selection is the entity on which natural selection acts to drive evolutionary change.
6 Explain why evolution by natural selection can not occur if the variation in a characteristic does not contribute to differences in fitness?
If there is not reproductive fitness conveyed by a variant trait, then natural selection has nothing to select and nothing to promote into the populational gene pool.
In the book The Origin of Species does evolution occur by means of natural selection?
Yes, that is what Darwin thought. However this has never been shown to be true.
Which of the following is necessary for evolution to occur?
Genetic variation is necessary for evolution to occur, as it provides the raw material for natural selection to act upon. This variation can arise from mutations, genetic recombination, or gene flow.
