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What does a mitochondrial genetic bottleneck result in?
GaleEncyofNeuroDis
The result is considerable variability in the amount of mutated mtDNA molecules that each of the offspring inherits
Wiki User
∙ 13y ago
Wiki User
∙ 13y agoThis term refers to a reduction in the number of mtDNA molecules followed by an amplification of this reduced mtDNA that occurs during maturation of the mother's eggs
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Which of the following would be most likely to decrease genetic variability. A bottleneck B B genetic drift C mutation D random mating?
A bottleneck event would decrease your population to a very small number and, consequently, your gene pool would contract, some alleles would be lost and genetic variability would decrease. Google Cheetahs.
Which organelle contains all of your DNA or your entire genetic make-up?
The nucleus. Mitochondria also contain DNA, but not your whole genome. Your mitochondrial DNA comes only from your mother.
Does genetic drift increase or decrease genetic variation in populations and why?
It is important to understand that each individual has different genes. Genes can be lost if an individual dies without reproducing. To answer your question: There are two type of effects caused by Genetic Drift. The founder effect happens when a few species inhabit a new territory. If only those species reproduce then there are less genes in the gene pool and that leads to less variation. This can happen if storms sweep birds to a previously uninhabited island. The other effect is the bottleneck effect. This happens if a disease or poaching drastically reduces the number of individuals in a population. Since there are less individuals who can reproduce there are not as many genes that can be passed down.
Which would most likely decrease the genetic variation in the human population?
If the human population was reduced to a very small number of interbreeding individual then this small population, denied outbreeding, would have very little genetic variation. Humans, who went through a bottleneck event about 70,000 years ago, are considered a " small " species because they have little genetic variation in comparison to many other species. Google cheetah to see how this concept works.
During which process do rare changes in DNA result in genetic diversity?
Mutagenesis
Bottleneck can be caused by?
genetic flow.
What characteristic do a bottleneck and a founder effect have in common?
The founder effect a genetic bottleneck are similar in their effect on the genetic diversity of a local population in both situations. They result in the development of a population from a small number individuals and is likely to have reduced genetic diversity.
Types of genetic drift?
Founder effect & Bottleneck effect.
What is a restriction in genetic variability caused by a drastic reduction in population size?
population bottleneck
When is genetic drift a factor in evolution?
When there is low gene flow When there is no selective pressure When there is a bottleneck
An scientific example of bottleneck effect?
(In biology) The bottleneck effect happens when the size of a population or even an entire species is suddenly reduced, with lasting effects on at least one generation. A population bottleneck may occur after an epidemic, drought, fire, hunting, or other destructive events.
Can result in less fertility caused by increased inbreeding?
bottleneck
Genetic drift resulting from a disaster that drastically reduces population size is called?
The bottleneck effect.
What is a genetic bottleneck and are humans affected by one?
A population bottleneck (or genetic bottleneck) is an evolutionary event in which a significant percentage of a population or species is killed or otherwise prevented from reproducing. This reduces the genetic diversity of the population, and even if the population bounces back in size, it can often show evidence of the past bottleneck by lacking significant variation for its size. A good example is that of the cheetah, whose current population shows almost negligible variation. Humans are not currently experiencing any genetic bottlenecking because the population is increasing. However, there is evidence suggesting that the human population underwent one or more bottlenecks in the past, since its overall genetic diversity is relatively low for its size.
Bottleneck can result in less fertility caused by increased?
Bottleneck can result in less fertility caused by increased inbreeding. Inbreeding can cause many birth defects since the gene pool is limited.
Suppose individuals of a species of lizard on an island can be brown, tan, or green. Suppose a volcanic eruption on the island kills all but one male and one female lizard. Both are brown, and all later generations are brown. What is this an example of?
a genetic bottleneck
Is the population bottleneck an example of natural selection?
No. Population bottleneck refers to a period in which the size of a population becomes much reduced, thereby reducing the number of alleles in the gene pool - and thus genetic diversity.
