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Anthropology 101

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Mendel’s principle of inheritance
Principle of segregation
Two alleles per offspring, one from each parent
Independent assortment
Distribution of one pair of alleles does not influence another pair
Genes don’t blend

Eukaryotic and prokaryotic
Prokaryotic – are one celled organisms. Two kinds- bacteria and archaea
Cells structure is simple
Eukaryotes- every organism that has more than one cell. Cell structure is more complex than prokaryotes

Prokaryotes
Prokaryotic cells are one celled organisms they were the first organisms on the planet
First appeared around 3.7 bya
Have a free flowing nucleoid with no nuclear envelope
Cytoplasm- gel like, holds all of the cells internal structures (organellas)
Ribosomes- you should know.
Flagella- used for locomotion as well as a sensory tool (also present in eukaryotes)
Pili- help with attaching to surfaces and the transfer of dna

Eukaryotic
First appeared 1.5 bya
Has a nucleus contained in a nuclear membrane
Many more organelles
Mitochondria

Mitochondria
Responsible for producing energy
Separate dna called, mitochondria dna, which is only passed down through the mother

Eukaryotes
Two types of cells in complex organisms
Somatic cell (body cell)
Diploid-has full set of paired chromosomes (46)
Gamete cell (sex cell)
Haploid-only has half of the chromosomes (23)

Cell division
Required for an organism to, Grow, Mature, Maintain tissues, reproduce
Mitosis and meiosis
Mitosis
Prophase
Metaphase
Anaphase
Telophase

Mitosis: prophase
Dna replication has resulted in chromosome duplication
Centrosomes position themselves on either side of the nucleus
Nuclear membrane dissipates

Mitosis: metaphase
The duplicated chromosomes align in the center of the cell
Centrosomes attach themselves to the chromosomes and prepare to separate them

Mitosis: anaphase
The two duplicated chromosomes are pulled apart by the centrosomes
Chromosomes are moved to separate ends of the cell

Mitosis: telophase
Final stage of mitosis
Components of a new cell begin to appear
Two new nucleus structures are formed by building a nuclear membrane around the two new groups of duplicated chromosomes

Cytokinesis
The stage after mitosis
The cells divide to form two identical cells

Meiosis: gamete production
Meiosis I
Prophase, metaphase, anaphase, telophase
Meiosis II
Similar to mitosis except that the duplicated chromosomes align with the homologous other chromosomes (one from each parent) get tangled up and exchange genetic material: crossover

Meiosis: prophase 1
The whole event of crossing over that causes the formation of newly coded chromosomes: recombination

Anaphase 1
Similar to mitosis
Except in meiosis they separate as pairs, each with a new combination of genetic material

Telophase 1
Cytokinesis: two cells with 23 new unique duplicate chromosomes
Prophase 2
There is no dna replication
Aim to separate the duplicate chromosomes

Meiosis 2
Metaphase 2, anaphase 2, telophase 2 and cytokinesis
Four cells each with 23 new chromosomes: gametes

Mechanisms of evolution
Microevolution
Breeding population vs total population
Deme- a local population of organisms that have similar genes, interbreed and produce offspring
Gene pool- all of the genetic material within the reproductive members of a population
The changes of allele frequency
From one generation to the next
Within a population
Between populations

Macroevolution
The bigger picture-large scale evolution
Speciation-the formation of a new species by one species splitting into two or more
Observes evolutionary events and how they occur over hundreds of years

Species -group of organisms capable of interbreeding and producing fertile offspring

Nonrandom mating
Random mating
Variation
Nonrandom mating
Reproductive selection for specific traits
Example: dog breeds

Evolutionary forces
4 mechanisms of evolutionary forces mutation natural selection genetic drift gene flow

mutation change in genetic code only source of new genetic material/genetic variation occurs during mitosis or meiosis most are harmless

mutation only evolutionarily important if in a sex cell advantageous deleterious neutral can be spontaneous – reasons not known can be induced- as a result of radiation or toxic chemicals

point mutation base substitutions synonymous mutations-changes in the base pair do not produce a different amino acid non synonymous mutations-changes in the base pair leads to a different amino acid base insertion base deletion frameshift mutation- either deletion of insertion shifts the reading frame for RNA

chromosomal mutations chromosomal deletion- when a section of a chromosome is deleted chromosomal duplication- when a section of a chromosome is duplication chromosomal inversion- when a section of a chromosome is inverted chromosomal translocation- when a section of a chromosome breaks off and attaches to a section of another non homologous chromosome non-disjunction is a change in the number of chromosomes an extra chromosome in the 21 slot leads to downs syndrome

natural selection biological characteristics that enhance survival will increase in frequency from generation to generation fitness- the ability of an offspring to survive and reproduce, thus passing its genotypes to subsequent generation driven by four basic principles: variation heritable populations have more offsprings than resources allow favorable traits lead to fitness

modes of selection directional selection- a favored trait is at the extreme expression of traits tall being selected against, giving short an advantage stabilizing selection-selection against extreme expression of traits babies’ weights disruptive selection-both extreme traits are selected for, to the exclusion of the other sexual skeleton survival is important, but so is reproduction make yourself more appealing to the opposite sex intimidating, deterring, or defeating rivals

genetic drift random change in frequency of alleles greater impact on small populations two examples: bottleneck effect and founders effect bottleneck effect examples: catastrophic event, decline in population, survivors successfully reproduce result: reduced genetic variability founder effect small band of “founders” colonize new region no interbreeding with parent group different allele frequency

gene flow movement of alleles from one population to another through migration immigration and emigration there has to be reproduction

speciation formation of a new species from a parent species step 1: reproductive isolation eliminate gene flow forms of Ri; geographic isolation; behavioral differences step 2: genetic divergence mutation: natural selection

adaptive radiation the formation of several species from a single common ancestor often happens when an organism enters a new area with new ecological opportunities to better its fitness can also result from new phenotypes that allow for exploiting new niches extinction of on organism creates opportunities for another to expand

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