aydanbelle
30.01.2020 •
Biology
When we look at islands across the planet (think the islands of the galápagos and hawaii) we see that there are a remarkable number of island endemic species, species that are found nowhere else. what is a possible explanation for this observation? sympatric speciation on islands is easier than in mainland environments because rates of chromosomal evolution are higher on islands.extinction rates are lower in islands so species that have gone extinct elsewhere persist on islands.sympatric speciation on islands is easier than in mainland environments because levels of disruptive selection are higher on islands.vicariance events are more common on islands than in mainland environments.island isolation promotes allopatric speciation.island isolation promotes allopatric speciation.
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Ответ:
Island isolation promotes allopatric speciation.
Explanation:
Allopatric speciation is a form of speciation (creation of new species) that occurs as a result of geographic isolation. This means that a part of population becomes physically separated from the initial main population. There is no gene flow between these two populations and as a result the two populations reach a high level of genetic divergence. They can no longer interbreed which means they become two different species (speciation).
New populations evolve as result of mutation, genetic drift and natural selection.
For example, Galapagos finches are isolated from others by the ocean (geographic isolation). Because of the isolation, the finches don’t breed with one another. So, they developed unique characteristics and became endemic.
Ответ:
Explanation:
Natural killer cells (NK cells) are a type of lymphocyte and also a component of innate immune system. NK cells play various functions in immune system and they play a major role in the host-rejection in virally infected cells.
NK cells are activated in response to interferons and also by various other responses. NK cells work to by secreting IFNγ and TNFα. Natural killer cells play a very important role in early host defense against viruses.