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What type of genetic drift occurs when a small group leaves a larger population?
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When genetic drift occurs due to a dramatic reduction in population?
the bottle neck effect
What process occurs when local units of a population become reproductively isolated from other units?
genetic divergence
What are the mechanisms of natural selection?
Basically, natural selection, genetic drift and gene flow into and out of population of organisms.
What is genetic drift-?
Genetic drift is the random change in the frequency of alleles within a population's gene pool. It can cause the genetic composition of a population to change in one direction or another. Combined with natural selection, genetic drift is a principal force in biological evolution.Another Answer:Genetic drift is where random chance events which can effect the gene's abundance in a population, regardless of whether the gene is advantageous or not. For example, a natural disaster kills animals indiscriminately, regardless of their genetic makeup.
What kinds of populations are affected by genetic drift?
Genetic drift occurs in all finite populations. However the effects of drift are more pronounced in smaller populations than in large ones. Meanwhile, even though they are more present in smaller populations, the drifting is more likely to occur in larger populations because of the larger number of different genetic combinations present. Throughout evolution of populations, genetic drifting effects all types of population sizes, though it is more likely in larger populations but more present in smaller populations.
One method of protecting the genetic identity of a population is the inability of spermatozoa to fertilize ova of a different species This is called?
Gametic incompatibility is a method of protecting the genetic identity of a population. In this method, sperm transfer occurs but the egg is not fertilized.
The situation in which allele frequencies of a population remain constant is called?
That situation is called a Hardy-Weinberg equilibrium. Not actually seen outside of the lab.
What term is defined as the change in allele frequencies that occurs when a new population is established?
Founder Effect
Genetic variation occurs when chromosomes are shuffled in and fertilization?
genetic variation occurs when chromosomes are shuffled in_and fertilization
What is a change in the genetic composition of a population of organism over a period of time?
A change in the genetic composition of a population of organisms over time is known as evolution. This occurs through processes such as natural selection, genetic drift, and gene flow, leading to changes in allele frequencies in a population's gene pool. These changes can result in the emergence of new traits, species, and adaptations.
What is a part of microevolution?
One example of microevolution is genetic variation within a population. This occurs because of the accumulation of small changes in the frequency of alleles (alternative forms of a gene) over generations.
If a population becomes isolate from other populations of the same species and then genetic divergence occurs that prevents them from breeding with other populations what is it called?
It is called speciation.
