CK12 Life Science
What is a genome? What is the most convincing evidence of evolution? How do the embryos of different species support the idea o ...
paleontologists Scientists who study fossils to learn about life in the past. radiometric dating A method to determine the age o ...
Microevolution and Macroevolution Microevolution You already know that evolution is the change in species over time, due to the ...
environment, acting on the phenotype allows theaallele to be maintained in the population through heterozygousAaindividuals. Car ...
no evolution - as long as five conditions are met: No mutation (no change in the DNA sequence) No migration (no moving into or ...
We will use only two alleles (sop+qmust equal 1), but similar equations can be written for more alleles. Allele frequency equals ...
ficial because it allows the giraffe to reach leaves high in trees. Natural selection caused this beneficial trait to become mor ...
them together again. If the two populations do not interbreed and produce fertile offspring, they are separate species. Geograph ...
Figure 7.27: Abert Squirrel on the southern rim of the Grand Canyon ( 26 ) signals. In this case, members of each group select m ...
Figure 7.28: Kaibab squirrel (a subspecies of Abert’s) found on northern rim of the Grand Canyon ( 19 ) ...
there are organisms that are evolving so fast that you may be able to observe evolution! Many scientists use bacteria or other s ...
Figure 7.30: Scientists have drawn many different versions of the “Tree of Life” to show different features of evolution. This “ ...
world is very old and has undergone some dramatic changes. Life has been on the planet for most of that time. As you will see in ...
How do you know if two related organisms are members of the same species? Why do the squirrels on opposite side of the Grand Ca ...
geographic isolation The separation of a population from the rest of its species due to some physical barrier, such as a mountai ...
Check Your Understanding What are fossils? How does the fossil record contribute to the evidence of evolution? Introduction It ...
Figure7.31: Themostreliablewaytofigureouttheearth’sageistomeasuretheradioactivity of certain minerals found in rocks (called rad ...
Figure 7.32: Some of the oldest fossils on earth are stromolites, made of algae and a kind of bacteria, found along the coast of ...
what kinds of materials were available then that could have been involved in the creation of life. Scientists believe the early ...
throughout history. Past catastrophic events, such as asteroids and comets also hit the earth long before humans evolved. The ge ...
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