Monday, August 26 th , 2012 TAKE OUT YOUR NAME PLATE AND YOUR BINDER
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Transcript of Monday, August 26 th , 2012 TAKE OUT YOUR NAME PLATE AND YOUR BINDER
Monday, August 26th, 2012TAKE OUT YOUR NAME PLATE AND YOUR
BINDER
• Target Covered: I. I will apply the concept of evolution by natural selection to examples and scenarios.
• What are we doing today?– Read Bed Bug Article– What is a theory?– Discuss data from Friday– Discuss Natural Selection– Discuss Natural Selection Scenarios in groups
• Announcements/Reminders– Don’t worry about diagrams for this unit. – See my wiki for homework– I will be checking things in Wednesday
Change places so that you are not with anyone from your Friday group. Bring your
nameplate
• Discuss Data from Friday• What factors came into play that influenced
predator success?• What factors came into play that influenced
prey success?• If all of your predators were knives, what
would have happened?
Evolution & Natural Selection• Our first unit in AP biology is the fundamental, unifying
concept of biology (and BIG IDEA #1): Evolution• The mechanism used to explain how populations of
organisms evolve is called Natural Selection• Natural Selection requires:
• VARIATION within a population for one (or many) traits• SURVIVAL of some variations more than others in a specific
environment• REPRODUCTION of those within the population who survive
• Differential survival and reproduction in a population means a group of organisms within a population in a given environment has a selective advantage.
The Armadillo Story
Extant organisms possess selective advantages for the environment in which they live.
The Armadillo Story
The environment determines whether or not the armadillo’s behavior has a selective advantage.
Natural selection concepts you should know & use!
• VARIATION• SELECTIVE PRESSURE or
ENVIRONMENTAL PRESSURE• SELECTIVE ADVANTAGE• SURVIVE & REPRODUCE• ADAPTATION• SPECIATION
Evolution by the Process of Natural Selection
Use the words below to fill in the flow chart:Environmental Over a (long) period of time (can use twice)Favorable Variation(s) Meiosis & crossing over
Speciation Selected For ( fitness)
Selection Pressure Unfavorable Variation(s)
Adapted Sexual Repro. (random fertilization)
Mutation BiogeographyMicroevolution
Selected Against ( fitness) Variation of alleles in a population Isolation MechanismsPolymorphism Macroevolution
Pre & Post zygotic
Population is well
Change in allele frequency within a population is called
biodiversity
Evolution by the Process of Natural Selection
Use the words below to fill in the flow chart:Environmental Over a (long) period of time (can use twice)Favorable Variation(s) Meiosis & crossing over
Speciation Selected For ( fitness)
Selection Pressure Unfavorable Variation(s)
Adapted Sexual Repro. (random fertilization)
Mutation BiogeographyMicroevolution
Selected Against ( fitness) Variation of alleles in a population Isolation MechanismsPolymorphism Macroevolution
Pre & Post zygotic
Population is well
Change in allele frequency within a population is called
biodiversity
4.
Random mutation
SexualReproduction
(random fertilization)
Meiosis & Xing over
VARIATION (of alleles in a
population)
environmental
selection pressure(s)
Favorable variation(s)Selected for (more likely to
survive & reproduce; have
fitness)
Selected against (LESS likely survive &
reproduce; have fitness)
Unfavorable variation(s)
MICROEVOLUTION
Biogeography & Isolation
mechanisms:Pre & post
zygotic
Macroevolution & speciation
OVER A PERIOD OF TIME
OVER A LONG TIME
polymorphismsADAPTED
Discuss your organism with your group
• What does it need to survive?• Does it have any special characteristics that
help it to get those things?• Pick one from your group to write about how
natural selection may have been at play. Use the next slide to help you.
Write how a trait one organism at your group has may have evolved by Natural Selection
Use ALL the terms below and underline terms in your definition
Limit your explanation to no more than FOUR sentences Each group member should write one sentence. Turn in group copy.
You are allowed to use a term more than once in your explanation
• Offspring• Reproduce• Environment• Selective pressure• Over time• Adaptation(s)
• Favorable (select[ed] for)• Unfavorable
(select[ed] against)• Variation(s)• Population• Survive (survival)