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Terms in this set (44)
who created the theroy of natural selection?
the process by which populations change over time
all of the individuals of a species that live in an area at the same time
what can a group of closely related organisms do?
mate to produce fertile offspring
a form of an inherited characteristics
the practice by which humans select plants or animals for breeding based on desired traits
what does artificial selection show?
it shows traits can change
are aquired traits passed on to offspring? why?
no, traits do not become part of an organisms dna
the process by which organisms that inherit advantageous traits tend to reproduce more successfully than other organisms do
what can the environment influence?
which organisms survive and which die
change in genetic material
what can genetic variation lead to?
diversity of organisms as a population adapts to changing organisms
four part to natural selection
overproduction, genetic variation, selection, adaption
animal reproduces and makes more offspring than the enviornment can support.
only some survive
passed on from parent to offspring, the more gv in a population, the more likely it is some individuals might have traits that will be advantageous if the enviornemnt changes
individuals with a particular trait are more likely to survive long enough to reproduce traits become "selected "
inherited trait that helps an organism survive in its enviornment
over time adaptions grow more common in the population with each new generation. over time populations become more adapted
what is one of the main sources of genetic variation?
What do beneficial mutations help one do?
survive and reproduce
What can changes in environmental conditions can affect what?
affect the survival of organisms with a particular trait.
If an enviornment changes who is most likely to survive?
species with a genetic variation, which results in a variation of traits
What happens if no animals have the traits needed to survive and reproduce in a changed enviornment?
a species will become extinct
occurs when all members of a species have died
What shows that many animals on earth have become extinct?
the fossil record
through what do breeders choose the traits that are passed on to the next generation?
Natural selection can act only on what?
preserved remains of once-living organisms
evidence that animals have changed over time is found in?
amber, ice, or sedimentary rock
process in which minerals in the sediment may seep into the organism and replace the body's material with minerals that harden over time
provides evidence about the order in which species have existed through time, and how they have changed over time
fossils that help fill in gaps in the fossil record
the most recent species from which two species have evolved
what does structure show in organisms?
related organisms share structural traits
the greater number of similarities between molecules of species shows what?
the more recently the two have most likely shared a common ancestor
organisms that have fewer amino acid differences are more like to what?
be closely related
the study of development
the farther down the fossils are found, the older they are
using radioactive elements to date the fossils
What is an example of the radioactives used in absolute dating?
body structures that are formed in similar ways during development, and share similar patterns, but perform somewhat different structures
structures that are similar in function am superficially similar in form, but the development/internal structures are very different
there are structures in animals that show gradual changes over time. These are the reduced or lost structures
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