Answer:
Allopatric speciation
Explanation:
Allopatric speciation refers to the geographic separation of a continuous genetic background, originating two or more new geographically isolated groups. These divergences of the original population might be related to migration in different directions, extinction of geographically intermediate populations, or geological events. During these events of speciation, emerging new barriers impede genetic flow between groups, as the two new populations that are separated can not get together and mate anymore. These barriers might be geographical or ecological.
Different stages are involved in the allopatric speciation process:
• The emergence of the barrier.
• Interruption in the genetic flow
• Slow and gradual differentiation due to the occurrence of mutations in each population and their accumulation in time.
• Genetic divergence by natural selection and reproductive isolation, impeding the two groups to mate even if the barrier disappears.
• Prezigotic isolation mechanisms favored by selection a secondary contact between the new species occurs.
The Panama isthmus is an example of allopatric speciation caused by an extrinsic geological barrier that interrupted the genetic flow between species driving to genetic changes and reproductive isolation.
Two different groups that evolved in allopatry might meet again in secondary contact if the barrier that separated them, disappears. In the Panama isthmus example, the groups that did mate, could not produce any fertile progeny because of postzygotic reproductive isolation. And the groups that did not mate, were not attracted to each other because of prezygotic reproductive isolation.
Answer:
explain six changes of the man life after begining of agriculture
Answer:
C
Explanation:
Population is the number of simular species in the area, so the land and fish don't count.
The correct answer I would say it's c it actually has 12 but around 15 depending on what type and brand
From the Egg viability hypothesis, we can predict the following;
A. Probability of hatching failure will
be higher for eggs laid later within a clutch.
This is because viability of unincubated eggs decline overtime.
B. The probability of hatching fail will be higher for eggs laid later within a clutch.
This is because large clutch affects or changes nest micro-climate which result to increase in water loss during incubation period.
