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Ch 11 & 14.4 Populations notes

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Ch 11 & 14.4 Populations notes

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Basically the notes from the unit with words missing and a word bank. Put the right word in the right place.

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Ch 11 & 14.4 Populations notes
 

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Ch 11 & 14.4 Populations notesOnline version

Basically the notes from the unit with words missing and a word bank. Put the right word in the right place.

by Brian Pichola
1

It ? s an organism ? s ( traits ) that make it better fit its
And these traits come from the it has
All of the alleles in a population is known as its
is a change in the gene pool of a population over .
This involves changes in ( how often an allele shows up ) over time .

2

Look at the picture .
See how the alleles are GGGGGGGggggg ? that ? s the .
See how 7 / 12 are G ? That ? s an of . 583 or 58 . 3% .

3

? DNA can randomly ? we have approx . mutations , but most are unnoticeable .
Recombination ? and crossing overduring meiosis make our genes from our parents ?

4

So it ? s the that we really see in evolution
Traits can be caused by 1 gene or many . Most are ? controlled by genes
So you don ? t get just phenotypes , like what we studied in the genetics unit
Get a of phenotypes ? many ones .

5

With polygenic traits , you get this of phenotypes rather than just
This is called a curve or distribution
If this changes , has happened

6

selection
Individuals at end of curve are most for environment
e . g . keep having to give and more because bacteria become resistant

7

selection
Organisms with trait survive best
e . g . Gall flies ? woodpeckers eat big galls , wasps eat small ones , medium

8

selection
Organism at extremes are fittest
e . g . Lazuli Buntings ( birds ) . Bright blue feathers get more , but also attack " medium " blue feathers . Brown ones not survive

9

So that ? s how evolution occurs by
Can also occur by or chance and not by natural selection
Evolution by random is called
Usually has a bigger effect in populations , because larger ones can recover from these .
The changes when organisms a population and join another one .
This is called . is when they join , is when they leave .

10

Bald Eagles flying away from the .
Is this immigration or emigration ?
! They from the red area
They to the black dots
In both cases , their go with them
Alleles can ? t " move " on their own ! The moves and the alleles leave / enter the , with the organism

11

effect
When an ( e . g . disease , , hurricane ) wipes out a large part of the population
the allele frequency may change , but because of
In this example some of the peccaries ( ) die from a , but not because they " fit " better or worse ? just

12

effect
When a few individuals the group and start a new
They may not have all the in the original population , so the has changed , but not because of
In this example , only yellow and blue flowers were moved by the bird ? again , not " fitting " , just

13

In , mates are chosen
This usually doesn ? t happen , especially with animals
Animals usually choose mates based on some ? brightest feathers , prettiest eyes
This is called
animals or plants for certain is called

14

When a population isn ? t evolving , it is in genetic equilibrium , aka
remain constant according to the Hardy - Weinberg Principle .
In other words , a population in H - W Equilibrium ? s allele frequencies don ? t , and the organism is not

15

p + q = 1
p2 + 2pq + q2 = 1

= frequency of dominant allele
= frequency of recessive allele

= frequency of homozygous dominant
= frequency of heterozygous
= frequency of homozygous recessive

16

predicts populations will stay in genetic equilibrium as long as :
population size ( has lesser effects , then )
No ( organisms / alleles don ? t the population through immigration ( coming in ) or emigration ( leaving )
No happen to change the alleles available
There is mating ( i . e . no artificial or sexual selection )
There is no ? all traits help the organisms survive
H - W principle is kind of a " what " . We know what it takes for evolution to occur , what would it take for evolution to occur ?

17

Another way to think of it is that a species / population will not unless :
The population is ( )
Organisms enter or leave on their own ( )
occur
selection happens ( nonrandom mating )
happens ( a trait appears that aids survival )

18

A is a population who members can interbreed and produce offspring .
Evolution has occurred when 1 organism is so different from another that they ? t mate any more .
This is called

19

There are kinds of reproductive isolation :
: When organisms act differently and stop , e . g . fireflies blinking at different rates
: When organisms in the same area mate at times from each other , e . g . pine trees opening at different times of year

20

Geographic Isolation
When a population is separated by a ( river , lake , canyon , mountain ) and can ? t
e . g . Isthmus of Panama separating shrimp populations in the Atlantic and Pacific oceans

21

Birds arrive from mainland onto islands ( )
Birds travel to another island , water separates them ( )
Changes in because of natural selection e . g . different seeds to eat = changes in size / shape ; different plants = different to hide / stand out
: birds fly back , but are different now , don ? t mate
Birds continue to compete , move around and

22

evolution
Organisms from different ancestors evolve in environments to have similar
leads to structures
e . g . Dolphins ( mammals ) and sharks ( fish ) have similar , though they are

23

evolution
What we ? ve been talking about all along
common ancestor leads to descendants
Leads to and vestigial structures

24


When organisms on each other so much that as one , the other does also
e . g . ants and acacia trees ,
e . g . crabs and the they eat ( see picture )

25


Evolve to inhabit habitats and
e . g . After dinosaurs died , evolved to fill all kinds of ecosystems
e . g . Darwin ? s finch

26

If evolution doesn ? t happen , species can go :
Very slowly , a few species at a time = .
What we usually think of as a is and then dies out
Relatively quickly , many species at once is a
mass extinctions in Earth ? s history
Last one was ? dinosaurs
Biggest one was Permian . . . 250mya ? of all species wiped out !

27

: very slowly with changes noticed
: short followed by long time frames with change

28

Things that control growth of a population :
, Emigration , . Death

Growth of populations is based on resources available :
, Water , Space . Oxygen , / protection , Sunlight

29

Happens when there are resources
Population to grow
e . g . rabbits brought from England to Australia grew because there was no for food and predators

30

Happens when there are resources
3 phases :
growth at beginning
growth in middle
growth / stability at end
Most populations grow like this and reach their ? maximum number of organisms for those
Sometimes the population will grow the carrying capacity .
Then there are resources and more deaths occur and the population .
Then there ? s plenty of , so more occur and the population increases
So in reality , the line kind of back and forth around the carrying capacity
If the population quickly decreases for some reason , it ? s called a

31

Anything that controls how large a population can grow is called
Some of them depend on the number of in an area
These are called limiting factors
Examples include food , , space , shelter / protection , ( affects more closely spaced organisms )
e . g . moose and wolf population . Wolves use moose for and there are only so many moose

32

Some of them do depend on the number of individuals in an area
These are called limiting factors
Examples include human activities ( pollution , ) and natural ( hurricanes , , unusual weather )
E . g . if there ? s a forest fire , it doesn ? t matter how may are there . The population will .

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