Quiz 3 Biodiversity and evolution Flashcards
in order for natural selection to occur__
the trait must lead to differential reproduction
ecologist say that niche is like a species __ while habitat is like its ____
Ocuppation and address
the first phase of the speciation is___
geographic isolation
what is the term used to describe the small genetic changes that occur in a population
Microevolution
An ___ always has a narrow niche
Specialist species
most of what we know of the earth’s life history come from____
Fossils
if the environment conditions are constant __ are favored because they have fewer competitors. if the environmental conditions change rapidly, then the ___ is better off
Specialist and generalist
in natural selection, three things must happen EXCEPT
rapid changing environment favors specialist species
evolution refers to ____
changes in a population’s genetic makeup through successive generations
a species of newt produces a toxin that can kill predators. Scientist have observed that some farter snalke can feed on the newts because they have a natural resistance to the toxins. in areas where populations of newts and garter snake interact
what prediction is BEST supported by evolutionary theory?
the garter snakes with resistance to the toxin will successfully reproduce and pass the trait on their offspring
random changes in genetic code (DNA) of an organism
Mutation
Genetic variability in a population arises through ___
genetic sequences of dogs and foxes
it occurs when mutations and change by natural selection operate independently in the gene pool of geographically isolated populations
reproductive isolation
scientific evidence shows that modern dogs, wolves and foxes all have a common factors, further evidence shows that dogs are more closely related to wolves than to foxes
what is the best evidence that dogs are more closely related to wolves than to foxes?
the genetic sequences of dog and wolves are more similar than dogs and foxes
