Download Chap 13 PP Notes

Chapter 13 PowerPoint Notes
Name:
Darwin’s theory of evolution by _______ _________ is supported by 4 major points:
1. _______ variation exist w/in the genes of every population or species (the result of ______ mutation &
translation errors).
2. In a particular environment, some individuals of a ___________ or _________ are better suited to survive
(as a result of variation) and have more offspring (natural selection).
3. Over time, the _________ that make certain individuals of a population able to ________ and _______
tend to spread in that __________.
4. There is __________ evidence from ______ & many other sources that living species evolved from
organisms that are _________.
Darwin’s Ideas Updated:
Change within populations:
Darwin’s main point was that in any population, the individuals that are ______ suited to survive & do well in
their environment will produce the most offspring. So, the ______ of those individuals will become ______
common in each new generation.
Now, we know that _______ are responsible for _________ traits.
__________ ________ causes the frequency of certain alleles in a population to increase or decrease over
time.
___________ & the recombination of _______ that occurs during ______ reproduction provide for
endless sources of _______ variation.
___________ Formation
Because the __________ differs from place to place, ________ of the same species living in different locations
tend to _______ in different __________.
_____________ ___________ is the condition in which two populations of the same species do not breed with
one another b/c of _______ separation, a difference in mating ______, or other ________ to reproduction.
The ________ of Evolution
Evolution is understood to be a _______ process that occurs continuously.
This is called ____________.
Some scientists believe that evolution of some species may actually occur in ______ ______, followed by ______
periods of no change. This change is called ____________ _______________.
Natural Selection
Over time, natural selection results in changes in ______ characteristics of a population. These changes _______
a species _______ in its environment
_________ of Evolution
The __________ Record
__________ Distribution of Living Things
____________ Body Structures
____________ Organs or Structures
Similarities in ____________ Development
Changes in ____________
___________ & Development
Studying the anatomy of different types of organisms often reveals basic ______ in body ________ even through
the structures ___________ may differ between organisms.
________ structures
___________ structures
__________ development
Chapter 13 PowerPoint Notes
Name:
Homologous Structures-structures that have different ________ forms in different organisms, but develop from
the same embryonic tissue.
______________ organs-organs that serve no useful function in an organism i.e. ________, miniature legs, arms
CHANGES IN ________
Natural Selection at Work
________ – a change in the nucleotide-base sequence of a gene or DNA molecule
If species have changed over time, then the ________ that determine the species’ characteristics should also
have changed by _________
Examples of Evolution
Evolution of _________ resistant diseases.
The _______ needs to survive to reproduce.
Eventually, a mutation will occur in its __________ that will allow even one _____ cell to fight off the ________.
As it ________, more antibiotic resistant cells are made and the antibiotic currently used becomes ______.
Darwin’s _________: different ______ utilized during food shortage.
Formation of a new __________
__________ formation occurs in stages.
Natural selection favors changes that increase ____________ success.
So, species are improved to “____” into their _____________ (ie. Fitness).
__________________ of differences between groups- ________________.
____________ leads to the formation of new _________________.
Formation of new species- ______________.
Forming subspecies
In environments differ enough, then separate populations of the same species can become so different that they
become a new _______________.
Populations of the same species that differ _____________ b/c of adaptations to different ______ conditions
become __________________.
Once they are ______________ enough, the subspecies may become a completely _______ species.
Due to ___________ barriers that form.
Summary of Darwin’s Theory
 ___________ in nature differ from one another
 Organisms in nature produce _______ offspring than can survive, and many of those who do not survive do
not _________.
 Because more organisms are produce than can survive, each species must ________ for _____________
 Each ________ is unique, each has ____________ and ___________ in the struggle for _________
 Individuals _______ suited for the environment _________ and _________ most successful
 ______________ change over time
 Species alive today _______ with __________ from species that lived in the past
 All organisms on earth are united into a single ___________ __________ of life by __________ _________