Topic 4 Conservation and Biodiversity. 4.1.1 Define the terms biodiversity, genetic diversity,...
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Transcript of Topic 4 Conservation and Biodiversity. 4.1.1 Define the terms biodiversity, genetic diversity,...
4.1.1 Define the terms biodiversity, genetic diversity, species diversity, and habitat diversityQuiz on these four terms on Monday!I will give you the word, you just have to list
out the words.
PRESENTATIONSIf you were not here for yours, you can
email the slides to me and I will grade them, but you still need to come after school to present them to me.
4.1.2 Outline the mechanism of natural selection as a possible driving force for speciation.There is a diverse array of life on this planet.Why?Different conditions in different parts of the world
make certain traits more successful.These successful traits are called adaptations.As these changes or adaptations build up in
populations, eventually you get two groups that can not interbreed. You now have a new species!
4.1.2 Outline the mechanism of natural selection as a possible driving force for speciation.A phrase often associated with natural selection
is “survival of the fittest”.What do you think of when you hear this?Fitness refers to a better potential for survival. More specifically, a better potential for survival
of ones genes. The best adaptations often mean that you are a
more desirable mate, and therefore, will pass your genes on to more offspring.
4.1.2 Outline the mechanism of natural selection as a possible driving force for speciation.Let’s look at some organisms in nature.For each organism, think about an
adaption or two that has increased its fitness.
4.1.2 Outline the mechanism of natural selection as a possible driving force for speciation.Natural selection has four main ideas.
1. Individuals within a population are varied in their traits.
2. These traits are heritable.
3. More offspring are produced than can survive, or, individuals vary in their success at surviving and reproducing.
4. Survival and reproduction is NOT random. Those with the most favorable adaptations, the highest fitness, survive and reproduce which means that they pass on those heritable traits to their offspring.
4.1.2 Outline the mechanism of natural selection as a possible driving force for speciation.What kinds of situations can lead to
natural selection happening?Competition for a resourceCompetition for a mateIsolation
ReproductiveGeographic
Geographic Isolation Simulation1. Tear a single sheet of paper into four pieces.
a. On two of the pieces write a capital letter “A”.
b. On two of the pieces write a lower-case letter “a”.
c. These letters will represent the allele for head type.
1. A = hat-on
2. a= no hat
2. For the first round each one of you will be an individual with a genotype of “Aa”. So, in your hand, have a “A” and “a”.
3. You will now “mate” with someone in the class. Watch the demonstration in the front of the room.
4. Go back to your seat and be ready to share your genotype when called on.
5. Copy the data table from the board. After each round, fill in the data.
6. Think about how this activity supports the idea of geographic isolation leading to speciation. You will be writing a DEC IA for this, due next Friday. More details and a writing guide to follow on Monday.
Geographic Isolation SimulationGeneration AA Aa aa Total
allelesA
frequencya
frequency
1 24 48 .5 .5
2 9 10 5 48 .58 .42
3 7 13 4 48 .56 .44
4 3 13 8 48 .4 .6
Geographic Isolation incident happens!
5
So, what is the question here?
How does the data from this simulation support the idea of geographic isolation leading to speciation?
What changes could have been made to this activity to make it a more “realistic” simulation of geographic isolation?
How does geographic isolation lead to speciation?
Discuss, Evaluate, Conclude IA Levels/marks
Aspect 1 Aspect 2 Aspect 3
Discussing and reviewingEvaluating procedure(s) and suggesting
improvementsConcluding
Complete/2 Discussion is clear and well reasoned, showing
a broad understanding of context and the
implications of results.
Identifies weaknesses and limitations and
suggests realistic improvements.
States a reasonable conclusion, with a
correct explanation, based on the data.
Partial/1 Discussion is adequate, showing some
understanding of context and implications of
results.
Identifies weaknesses and limitations but
misses some obvious faults. Suggests only
superficial improvements.
States a reasonable conclusion or gives a
correct explanation, based on the data.
Not at all/0 Discussion is inadequate, showing little
understanding of context andimplications of results.
The weaknesses and limitations are irrelevant
or missing. Suggests unrealistic improvements.
States an unreasonable conclusion or no
conclusion at all.