Chapter 15,16,17 Evolution

4

A common ancestor for both species C and E could be at position number....

aardvark and golden moles

By using the evolutionary tree, identify the groups to which elephant shrews are most closely related?

A population can no longer interbreed under natural conditions with other closely related organisms

a new species of organisms has occurred when.....

convergent evolution

although the seal and penguin both have streamlined, fish like bodies with a layer of insulting fat, they are not closely related. This results from....

the large fish get caught in the net so their population will go down, the smaller fish have the advantage so their population will increase

describe how the size distribution of adult fish in the population would most likely change overtime

because they look alike

describe the most likely reason why scientists originally classified elephant shrews?

Some people believe that the large fish would not come back because there would be no large fish to produce other large fish. The gene has to come from somewhere.

even if the use of nets that selectively catch larger fish where stopped some believe large fish would not come back, why?

small fish have the advantage to escape the net therefor the small fish survive and the large fish die. the next population will be mostly small fish because there will be only small fish to reproduce

explain how natural selection would produce a decrease in the large fish population and an increase in the small fish population

evolution takes several generations, requires reproduction, and changes the whole population develop is when one individual organism grows in size and develops into an adult, occurs within the individuals lifetime

how are the terms "evolution" and "grow and develop"

scientists analyze their DNA

identify and explain the evidence scientists most likely used to build the evolutionary tree and reclassify elephant shrews?

comparing homologous structures, and the ability to produce fertile offspring

identify one other type of evidence scientists used to determine their relationship

an inherited characteristic that improves an organisms chances of survival

what is an adaptation

the natural differences that occurs between individuals in a species

what is natural variation

ancestral penguins without large wings are better able to swim and feed in the water; therefore they passed their genes for shorter wing structures onto their offspring

which of the following is probably the best explanation for the fact that Antarctic Penguins cannot fly, although there is evidence that millions of years ago their ancestors could do so?

physical separation of populations prevents interbreeding and mixing of gene pools

which of the following statements best explains why geographic isolation can lead to speciation