Natural Selection
what is natural selection?
mechanism of evolution where organisms with traits better suited to their environment survive and reproduce more successfully, leading to the gradual increase in the frequency of those advantageous traits in a population over time.
what is evolution?
process by which species change over time.
what is variation?
the differences in characteristics (traits) among individuals within a populatio
what is a cladogram?
a diagram that shows the evolutionary relationship between 2 species
how do u read rock layers?
from bottom to top.
what happens to organisms that are NOT best suited for their environment?
reduced survival and reproductive success, potentially leading to their extinction
what is variation?
a genetic difference among individuals in a population
how does variation drive evolution?
what are the lines on a cladogram called?
branches
what does the bottom read , what does the top read?
bottom = oldest
top = youngest
who discovered the process of natural selection and evolution?
Charles dwarin or Jean-Baptiste Lamarck
Charles Dwarin
without natural selection can organisms still evolve?
no.
what would happen if there was no genetic variation?
all individuals in a population would be identical, and there would be nothing for natural selection to act upon.
what does it mean when the branches are close
the organisms are closely related
why do organisms go extinct?
what are the 3 parts of dwarins natural selection process?
1. variation
2. overproduction
3. Competition
what is adaption?
a trait that has allowed an organism to better survive in its's environment/
whats the 2 main sources of variation?
1. mutations
2. sexual reproduction
what is the common ancestor and where is it located?
the common ancestor is located at the bottom of the diagram representing a species from which another species evolved from
more complex organisms are...
younger
What is the term for the idea that organisms with traits that are better suited to their environment are more likely to survive and reproduce?
What is survival of the fittest?
can aquired traits be passed down? why or why not?
no because they are traits that are developed not coded into DNA.
does natural selection require variation and why or why not?
yes because there must be variation within the population that allows some individuals to be better suited for the environment.
what is a descendant , and if the branches don't have a descendant what does that mean?
a descendant is a an organism that developed from another thing that existed earlier. if an organism doesn't descend it means it went extinct.
is evolutionary a fact or theory?
its both thanks to fossil records.