1. According to scientists who accept the ______) model, gene flow and migration
ID: 89045 • Letter: 1
Question
1. According to scientists who accept the ______) model, gene flow and migration between populations of archaic humans from different regions led to one species over time (i.e. modern humans).
2.
Both the replacement and multiregional models of human origins agree that there was an initial dispersal of Homo erectus (or ergaster) from (_______) into the rest of the Old World.
3.
According to the ecological species concept, in some cases different species:
4.
Punctuated equilibrium and Gradualism are models that explain:
5.
Which of the following best describes punctuated equilibrium?
A. can never produce offspring B. can breed and produce offspring under unnatural circumstances C. can only produce offspring in they live in the same ecosystemExplanation / Answer
1. Multiregional model
This model proposes that the human beings evolved simultaneously from different parts of the world. The H. erectus from africa migrates to other continents and slowly the migration and continuous gene flow between these populations led to the unified common homo sapien.
2. Africa
The initial rise of Homo genus is from Africa. The H. erectus evolved in africa and migrated to the rest of the world 2 mya. It evolved into other species of Homo genera and gradually into Homo sapiens.
3. B
The species concept works on the idea of reproductive success. If two organisms cannot interbreed a fertile offspring then they are said to be two different species. But in certain unnatural conditions like in laboatory, in vitro conditions, two members of different species can be interbred to made to produce a fertile offspring.
4. A.
Gradualism and punctuated equilibrium are two ways in which the evolution of a species can occur. Both have different logical inferences on how species evolved. Both do not talk about the qualities of a species that helped it to get selected. Both try to explain the Darwins evolution concept.
5. C
The punctuated equilibrium states that the very slow rate of evolution occurs most of the time, but on moment of burst or sudden change creates a major event in the speciation. Example:Consider a time when all the todays tigers had no strips. A mutation occurred in a few of the animals, causing a huge change: they were born with stripes.This new character helps them to camafloge well in the nature and find their prey more easily. Slowly the non striped ones died due to hunger and all the suvivors where the striped ones. They lived to reproduce, and their striped offspring also did very well. Over only a few generations, the whole population was born striped.
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