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johnruina b73a5fa310 vault backup: 2026-11-13 14:33:23 2026-11-13 14:33:23 -05:00
johnruina 4d49ee8168 vault backup: 2026-11-12 11:39:39 2026-11-12 11:39:39 -05:00
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[[Unit 3 (TBD)]]
Evolution is change in the population, not individuals. When changes in allele frequency occur, ==microevolution== has occurred, which is the smallest scale of evolution. Microevolution can eventually lead to ==macroevolution==, which is the creation of new species.
Example begin:
In the Richmond Hill High School forest there lives a population of bunnies.
Let B rep the allele for brown.
Let b rep the allele for white.
How many B? 3B/total 8 alleles
How many b? 5b/total 8 alleles.
Allele frequency of B is 0.375=p (represents allele frequency of dominant trait).
Allele frequency for b is 0.625=q (represents allele frequency of recessive trait).
| Generation | B | p | b | q |
| ---------------- | --- | ----------- | --- | ----------- |
| 1-baseline | 14 | 14/44=0.318 | 30 | 30/44=0.682 |
| 2 | 11 | 11/44=0.25 | 33 | 33/44=0.75 |
| 3 | 16 | 16/44=0.364 | 28 | 28/44=0.636 |
| 4 | 15 | 15/44=0.341 | 29 | 29/44=0.659 |
| 5 | 15 | 15/44=0.341 | 29 | 29/44=0.659 |
| 6-climate change | 2 | 2/44=0.046 | 42 | 42/44=0.954 |
![[Pasted image 20261110105109.png]]
Microevolution has occured because allele frequency changed.
From 0.318 to 0.409.
Natural selection.
To check if a change is significant, use chi square.
Example concluded.
Hardy-Weinberg equation.
If allele frequencies aren't changing, then the population is in ==Hardy-Weinberg== equilibrium (microevolution not occurring).
If allele frequencies change, then microevolution occurs, which can be due to:
* Natural selection.
* Genetic drift.
* Gene flow.
* Mutation.
* Non random mating.
For Hardy-Weinberg equilibrium to occur, these conditions need to be met:
* No mutation, no alleles can arise.
* No migration, no new members and alleles can join/leave.
* Large gene pool.
* Random mating.
* No selection, natural selection doesn't favor one phenotype over the other.
These 5 five things keep the population stable.
==Allele fixation== is when only one allele is present for a particular gene, allele frequency for one allele is 100%. It occurs more often in smaller populations.
![[Pasted image 20261110110316.png]]
Graph one represents Hardy Weinberg Equilibrium, graph 2 represents microevolution and graph 3 represents allele fixation.
$$p+q=1\\p^2+2pq+q^2=1$$ $p^2$ represents genotype frequency (homozygous dominant) while $q^2$ represents genotype frequency for homozygous recessive. $2pq$ represents genotype frequency of heterozygous.
Example 1:
Black dominant white recessive, 263 black geese 413 white geese.
"what is genotypic frequency of the white geese"
Let B rep black feather.
Let b rep white feather.
bb=$q^2$=413/676=0.6109
"what is allele frequency of white allele"
b=$q^2$=$\sqrt{0.6109}$
=0.7816
"what is alele frequency of black allele"
1-0.7816=0.2184
"genotypic frequencies of homozygous black geese"e
$p^2+2*0.2184*0.7816+0.6109=1$
$p^2=0.0477$
==ALWAYS FIND RECESSIVE ALLELE FREQUENCY FIRST==
"heterozygous genotype frequency"
2pq=2(0.2184)(0.7816)
pq=0.3414
Example concluded.
@@ -0,0 +1,10 @@
[[Unit 3 (TBD)]]
| Mechanism | Description |
| ----------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| Natural Selection | Process where the environment selects individuals in population with certain traits that make them better suited to survive and reproduce.<br>Variation: Must be heritable variation.<br>Selective pressures: Environmental conditions that select for certain characteristics against others.<br>Selective advantage: Genetic advantage that improves chance of survival.<br>Fitness: Struggle to survive. Those that survive and reproduce.<br><br>Examples:<br>- In 1848, 2% black moths as trees were covered in light colored lichen.<br>- In 1898, 95% black moths as the lichen was killed by air pollution resulting from the industrial revolution. |
| Mutation | Mutation are changes to the structure of DNA. Gene mutations are the change in the nucleotide sequence of an allele. Affects genotype frequency.<br>Provides new alleles and therefore new sources of variation in a population.<br>Might not immedietly affect phenotype.<br>If a mutation is harmful it's usually quickly eliminated from the population. |
| Non random mating | Individuals in a population select mates often on the basis of their phenotypes.<br>Can increase genotypic frequencies/homozygous traits.<br>Sexual selection: Selection by mating partners.<br>Artificial selection: Humans selecting favorable traits.<br>Inbreeding: Mating between relatives. |
| Gene flow | Transfer of alleles from one population to another. Individuals can move into or out of a population, which affects allele frequency in a population.<br>Can introduce new alleles to a gene pool of a population. |
| Genetic drift | Refers to changes in allele frequency due to random change alone. The change has nothing to do with their trait.<br>Larger effect on small populations.<br>Founder's/Founder effect: A small group leaves the original population, and by change the allele frequency of the group differs.<br>Bottleneck effect: Original population decreases in population size. Survivors represent a small fraction of the alleles that were present before the population decline. |
@@ -0,0 +1,17 @@
[[Unit 3 (TBD)]]
Natural selection is situational. It requires heritable variation, competition, and selective pressures.
==Selective pressure== are environmental conditions pressuring traits.
==Selective advantage== is a genetic advantage.
Sexual selection is mate selection for a particular phenotype. It may affect fitness.
Females choose their mates.
Good genes hypothesis: Females choose mates on traits that improve chance of survival.
Runaway hypothesis: Females choose on basis of traits that improve male appearance.
Sexual dimorphism: Different characteristics between male and females to the point that they appear to be separate species.
Intersexual selection: Females choose mates based on appearance/phenotype/behavior.
Intrasexual selection: Competition between the same sex of same species to pass on DNA.
Stabilizing selection: The intermediate phenotype is favored.
Directional selection: Favors phenotypes at an extreme of the range, resulting in the curve being shifted towards that extreme.
Disruptive selection: Both extremes are favored at the same time. Can eliminate the intermediate phenotype, resulting in speciation.
![[Pasted image 20261113110619.png]]