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What may rare genetic disorders become common in small populations through?
Wiki User
∙ 9y ago
This can occur through reproduction. If you have two people with the recessive gene for a rare genetic disorder, they have a 25% chance of having offspring with this disorder. The probability increases as the genetic pool increases.
Wiki User
∙ 13y ago
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How does roproductive isolation relate to evolution?
If two sub-populations of a species become reproductively isolated, it means that adaptation or genetic drift can make the two populations diverge genetically. If, as a result of this divergence, upon reintroduction, members of the two sub-populations no longer reproduce successfully, the two sub-populations have become different species.
What is one cause of speciation?
One cause of speciation is reproductive isolation or the separation of the population of a species from other populations so that it can change without keep getting mixed with other populations( and therefore becoming identical to other populations).
The situation of populations by barriers such as rivers mountains or bodies of water is called what?
Populations can become geographically isolated by barriers such as mountains or rivers. These barriers reproductively isolate the populations by restricting or preventing gene flow between them, leading to genetic divergence. Other kinds of geographic features, such as roads, canals, and even agricultural fields can have similar effects.
Describe the steps of speciation beginning with geographic isolation?
Two populations are isolated geographically (or mechanically - perhaps there is a mutation that prevents physical copulation, like a change in the direction of the turn of snail shells). One undergoes some selective pressure that the other does not, such as a change in the environment or new predators moving in. The population under stress adapts to the changes, and the genetic mutations involved are extensive enough such that if the two populations do meet again, they can no longer produce viable offspring.
Two populations that have no gene flow between them are likely to?
If there is no gene flow between two populations then they will eventually become genetically distinct, thus forming two separate subspecies. If this isolation continues for longer still, then the 2 populations become so distinct that if you cross-bred between them, then no viable offspring could be produced. This would mean that they had become two separate species.
What will happen to the genetic composition of the two populations of anole lizards?
Both populations will become more genetically diverse.study island
What does it mean if 2 populations of a species become isolated?
If two populations of a species become isolated, it means that they are separated from each other and cannot interbreed. Over time, this isolation can lead to genetic differences between the populations, potentially resulting in the development of new species through the process of evolution.
How does roproductive isolation relate to evolution?
If two sub-populations of a species become reproductively isolated, it means that adaptation or genetic drift can make the two populations diverge genetically. If, as a result of this divergence, upon reintroduction, members of the two sub-populations no longer reproduce successfully, the two sub-populations have become different species.
What happens when members from separated populations do not reproduce with each other?
Over time, the populations may become genetically distinct from one another due to accumulation of different mutations. This can lead to the evolution of new species if the genetic differences become significant enough to prevent successful reproduction between individuals from the two populations.
How can populations become reproductively isolated?
Populations can become reproductively isolated through mechanisms such as geographic isolation (resulting in allopatric speciation), behavioral differences (resulting in prezygotic isolation), or genetic changes that lead to incompatibility between individuals (resulting in postzygotic isolation). These barriers prevent gene flow between populations, leading to their divergence and ultimately speciation.
What statistical rule does genetic drift follow in small and large populations?
In small populations, genetic drift follows the rule that genetic variation can change quickly due to random sampling effects, which can lead to loss of alleles and increased genetic homogeneity. In large populations, genetic drift is less pronounced due to the dilution effect of larger sample sizes, which helps maintain higher levels of genetic diversity over generations.
Why aren't genetic disorders able to be caught?
because genetics is still a relatively new science. we are however able to catch some genetic disorder before they become obvious. However mucking about with the genetics of the unborn is fraught with as yet unseen and ethical dangers.
What is one cause of speciation?
One cause of speciation is reproductive isolation or the separation of the population of a species from other populations so that it can change without keep getting mixed with other populations( and therefore becoming identical to other populations).
What is allopatric evolution?
think Darwin's finches and galapagos tortoises... speciation that occurs when biological populations of the same species become isolated due to geographical changes such as mountain building or social changes such as emigration. The isolated populations then undergo genotypic and/or phenotypic divergence as: (a) they become subjected to different selective pressures, (b) they independently undergo genetic drift, and (c) different mutations arise in the populations' gene pools.[1]
What make small populations vulnerable to extinction?
there are several factors that make small populations vulnerable. First off there are demographic factors. If a small population faces a forest fire, they are more susceptible to extinction opposed to a large, wide-spread population. you also have the lack of genetic availability. without genetic variation, a species can become prone to disease. there are many more, and I could go on.
The situation of populations by barriers such as rivers mountains or bodies of water is called what?
Populations can become geographically isolated by barriers such as mountains or rivers. These barriers reproductively isolate the populations by restricting or preventing gene flow between them, leading to genetic divergence. Other kinds of geographic features, such as roads, canals, and even agricultural fields can have similar effects.
What evidence is there that the long and round did not become blended?
A number of genetic disorders are caused when an individual inherits two recessive alleles for a single-gene trait. Recessive genetic disorders include Albinism, Cystic Fibrosis, Galactosemia, Phenylketonuria (PKU), and Tay-Sachs Disease. Other disorders are also due to recessive alleles, but because the gene locus is located on the X chromosome, so that males have only one copy (that is, they are hemizygous), they are more frequent in males than in females.
