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3/28 Evolution (reproduction & speciation)

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Mr. Bowen

on 29 March 2018

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Transcript of 3/28 Evolution (reproduction & speciation)

Biofresh 3/28
1) What is a species?
2) How do new species come about?
3) Are dog breeds different species?
4) How are bad traits removed from a population of organisms?
5) How is evolutionary success measured?
6) What is your opinion about dolphins?

Evolution Notes 3 3/28
(EQ): How is evolutionary success measured?
Announcements
Be sure you've turned these in:
- Butterfly Natural Selection
- Animal Ancestry Research
- Any other assignments
Many people say evolutionary success can be considered "survival of the fittest". What does this mean?
?
(don't write this)
In the end, it's all about reproduction. Evolutionary success is directly measured by how many successful offspring are made.
vs
There are several ways to
increase the amount of successful offspring...
There are several ways to
increase the amount of successful offspring...
There are several ways to
increase the amount of successful offspring...
There are several ways to
increase the amount of successful offspring...
1: adaptations that make individuals more likely to survive
(to reproduce)
2: adaptations that increases the number of offspring
3: adaptations that increase how many times you reproduce
4: adaptations that increase parental care
(to make offspring more likely to reproduce).
increase successful reproduction
more offspring
more adaptations
(when you're done with this slide as part of your summary)
TABLE SHARE
As a table come up with 3 ways to increase evolutionary success
- You will share with class
- You will receive participation points for new ways
Don't write what's in Green
many
Few
Life Savers
If you eat 20 Twinkies will you gain a lot of weight if you have a fast metabolism?
- No Name
Metabolism is a word used to refer to all the processes your body does to grow and stay alive.
slow metabolism vs fast metabolism
sometimes being bigger is genetic
if you try to lose weight, your body thinks your starving so it tries to store a much energy as possible.
Table discussion:
You need at least 3 explanations.
Write your answers under you Biofresh.
Why do you think scientists think that humans are not really evolving any more?
Under your notes:
(don't write)
REVIEW
Mutations <> Selection
Speciation:
- the development of 2 new species from 1
Species = group of organisms that produce viable offspring
In order for 1 species to form 2, something has to stop them from reproducing.
Examples: genetic change, isolation, specialization, (more)
When they become different species they are in competition with each other.
sometimes people like to think nature is a beautiful place where everything is in harmony
NOPE
most of the time creating offspring means maximizing resources.
This means competition. Most species try to destroy everything else to create more room for themselves
kill
Humans Killed them all
What happened to the Neanderthals?
new traits?
removal of detrimental traits
(reproductive isolation)
What age do human parents push their offspring out of the nest?
Complete your Speciation assignment from yesterday.
"I know the feeling haunt you"
(that you're not on task)
^
1) What is a species?
2) How do new species come about?
3) How are bad traits removed from a population of organisms?
4) What is your opinion about dolphins?
Full transcript