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Where Natural selection favored alleles for increased melanin production in human living?
Natural selection favored alleles for increased melanin production in humans primarily in regions with high UV radiation, such as near the equator. Increased melanin provides protection against harmful UV rays, reducing the risk of skin cancer and preventing folate degradation, which is crucial for reproductive health. Conversely, in areas with lower UV exposure, lighter skin evolved to facilitate vitamin D synthesis. Thus, melanin levels in human populations reflect adaptations to varying environmental conditions.
What else can I help you with?
Are new alleles made by natural selection?
No - natural selection does not create new alleles. Variation in alleles needs to exist in the population in order for natural selection to occur. Natural selection will involve the change in allele frequencies over time, but it does not create new alleles. New alleles are the result of mutations.
What factor besides alleles affect phenotypes?
Enviroment, development, and behavior are all factors besides alleles that can affect phenotypes.
How is kin altruism related to natural selection?
Kin altruism is the tendency to behave in such a way as to provide benefit to a close relative at personal cost. One might think of sharing food, or calling out when a predator approaches. Natural selection is the differential replicative success of alleles. If one considers altruistic behaviour as (influenced by) the expression of a complex of alleles, then it is easy to see how aiding organisms that share most of your alleles (ie. relatives) would cause those alleles to spread throughout the population gene pool at an increased rate. In this manner, altruism could evolve as a result of natural selection acting on 'selfishly' replicating genes.
Will natural selection cause the allele's to disappear?
Natural selection can lead to the decrease or elimination of certain alleles in a population if they are less advantageous or detrimental to survival and reproduction. However, some alleles may persist in a population at low frequencies or in hidden forms due to factors like genetic drift or heterozygote advantage.
How is the sickle cell allele maintained through natural selection?
Individuals with two recessive alleles have very high rates of reproduction.
Are new alleles made by natural selection?
No - natural selection does not create new alleles. Variation in alleles needs to exist in the population in order for natural selection to occur. Natural selection will involve the change in allele frequencies over time, but it does not create new alleles. New alleles are the result of mutations.
How do alleles influence natural selection?
It's the other way around: natural selection is the natural process that causes the frequencies of occurence of alleles in the population gene pool to shift.
Which is a process that eliments harmful alleles from a gene pool?
natural selection
Does a homozygous alleles help more than a heterozygous to the natural selection?
yes it does :))
What role do alleles play in natural selection?
Genes are the medium by which inherited traits are passed on to offspring. It is inherited traits, and thus genes, that receive positive or negative selection.
Is this true Natural selection cannot operate efficiently against rare recessive alleles?
True
How is sickle cell alleles maintained through natural selection?
Heterozygous induviduals pass the dominant and recessive alleles to offspring
How could an organism end up with those two different beneficial alleles through the process of natural selection and genetic recombination?
An organism can end up with two different beneficial alleles through natural selection and genetic recombination. Natural selection favors traits that increase an organism's chances of survival and reproduction, leading to the spread of beneficial alleles in a population. Genetic recombination, which occurs during sexual reproduction, can shuffle alleles from different parents, creating new combinations of alleles that may be beneficial. Over time, these processes can result in an organism having two different beneficial alleles that enhance its fitness.
How is the sickle allele maintained through natural selection?
Heterozygous individuals pass the dominant and recessive alleles to offspring.
How is the sickle cell maintained through natural selection?
Heterozygous individuals pass the dominant and recessive alleles to offspring.
What factor besides alleles affect phenotypes?
Enviroment, development, and behavior are all factors besides alleles that can affect phenotypes.
How is kin altruism related to natural selection?
Kin altruism is the tendency to behave in such a way as to provide benefit to a close relative at personal cost. One might think of sharing food, or calling out when a predator approaches. Natural selection is the differential replicative success of alleles. If one considers altruistic behaviour as (influenced by) the expression of a complex of alleles, then it is easy to see how aiding organisms that share most of your alleles (ie. relatives) would cause those alleles to spread throughout the population gene pool at an increased rate. In this manner, altruism could evolve as a result of natural selection acting on 'selfishly' replicating genes.
