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Acclimatization

Physiological responses to the environment. (barrel chests in the Andes)

Adaptation

Physiological, anatomical, behavioral response to the environment. Adaptions result from evolutionary change.

Allele

Alternate forms of a gene. Occur at the same locus on paired chroms. and govern the same trait. Since they are different, their action may result in different expressions of that trait.

Amino Acids

Small molecules that are the components of proteins.

Autosomes

All chroms. except the sex chroms.

Bionomial(two names) Nomenclature

Taxonomy. Genus and species named created by Linnaeus.

Biocultural Evolution

Interaction of biology and culture. Biology makes culture possible.

Breeding Isolates

populations that are isolated from other groups geographically or socially.

Catastrophism

View that the Earth's landscape is from violent cataclysmic events. Cuvier's view counter to Lamarck's.

Culture

Set of learned behaviors transmitted from one generation to the next non biologically.

Dominant

Describing a trait governed by an allele that's expressed in the presence of another allele. Prevent the expression of recessive alleles in heterozygous.

Ecological Niche

Position of a species within it's biological and physical environments. Diet, terrain, vegetation, type of predators, etc. unique to each given species.

Endogomy

Mating with individuals in the same group.

Eugenics

Philosophy of race improvement through forced sterilization for one group and increased breeding for another.

Evolution

Change in the genetic structure of a population. Used also for the appearance of a new species.

Exogamy

Mating with individuals outside of your group.

Exons

Segments of genes that are transcribed and are involved in protein synthesis. (ex denotes that they are expressed.)

Fixity of Species

Species can never change.

Gametes

Reproductive cells developed from precursor cells in ovaries and testes.

Gene

Sequence of DNA bases that specifies the order of amino acids in an entire protein, a portion of a protein, or any functional product (RNA). Made up of hundreds or thousands of DNA bases organized into coding and non coding segments.

Gene Flow

Exchange of genes between populations.

Gene Pool

All of the genes shared by the reproductive members of a population.

Genetic Drift

Evolutionary changes, or changes in allele frequencies, that are produced by random factors in small populations. Result of small population size.

Genome

Entire genetic makeup of an individual of an individual or species.

Genotype

Genetic makeup of individual.

Heterozygous

Having different alleles at the same locus on members of a pair of chromosomes.

Homeobox Genes

Evolutionarily ancient family of regulatory genes that directs the development of the overall body plan and the segmentation of body tissues.

Hominin

Term for members of the group that includes modern humans and extinct bipedal relatives.

Homozygous

Having the same allele at the same locus on both members of a pair of chromosomes.

Hypoxia

Insufficient levels of oxygen in the body. Oxygen deficiency.

Inbreeding

Nonrandom mating in which relatives mate more often than predicted under random mating conditions.

Introns

Segments of genes that are initially transcribed and then deleted. They arent expressed so they arent involved in protein synthesis.

Lactase Persistence

Enzyme that breaks down lactose. Allows adults to ingest milk products. Discontinued production leads to lactose intolerance.

Locus

Postion or location of a chromosome where a given gene occurs. Sometimes used interchangeably with gene.

Macroevolution

Changes produced after many generations, such as the appearance of a new species.

Meiosis

Cell division in specialized cells in ovaries and testes. Meiosis involves two divisions and results in four daughter cells, each containing only half the original number of chroms.. Can develop into gametes.

Microevolution

Small changes occurring within a species, such as changes in allele frequencies.

Mitochondria

Structures contained within the cytoplasm of eukaryotic cells that convert energy, derived from nutrients, to a form that can be used by the cell.

Mitosis

Simple cell division; the process by which somatic cells divide to produce two identical daughter cells.

Mutation

A change in DNA.

Natural Selection

Refers to genetic change or changes in the frequencies of certain traits in populations due to differential reproductive success between individuals.

Nucleotide

Basic units of the DNA molecule, composed of a sugar, a phosphate, and one of four DNA bases.

Osteology

Study of skeletal materials.

Paleoanthropology

The interdisciplinary approach to the study of early hominins.

Phenotype

Physical characteristics.

Pleiotropy

Capacity of a single gene to influence several phenotypic expressions.

Point Mutation

Change in one of the four DNA bases.

Polygenic Traits

Referring to traits that are influenced by genes at 2 or more loci. Skin color, eye color, hair color.

Polymorphism

Loci with more than one allele. Can be expressed in the phenotype as the result of gene action (as in ABO) or they can exist solely at the DNA level within noncoding regions.

Polytypic

Referring to species composed of populations that differ in the expression of one or more traits.

Primate

Member of the mammalian Primates. includes lemurs, lorises, tarsiers, monkeys, apes, and humans.

Primatology

Study of the biology and behavior of nonhuman primates (lemurs, lorises, tarsiers, monkeys, apes).

Protein

3D molecule that serve a wide variety of functions through their ability to bind to other molecules.

Recessive

Describing a trait that isnt expressed in heterozygous. Must be homozygous to be expressed.

Sexual Selection

Type of natural selection that operates on only one sex of a species. Results from competition for mates and can lead to sexual dimorphism regarding one or more traits.

Sickle Cell Anemia

Severe inherited hemoglobin disorder where red blood cells collapse when deprived of oxygen. Results from inherited 2 copies of a mutant allele. Type of mutation that produces sickle cell allele is a point mutation.

Uniformitarianism

Theory that the Earth's features are the result of a long term processes that continue to operate in the present just as they did in the past. Elaborated on by Lyell, opposes catastrophism and contributed to the concept of immense geological time.

Vasoconstriction

Narrowing of blood vessels to reduce blood flow to the skin. Involuntary response to cold and reduces heat loss on the skin's surface.

Vasodilation

Expansion of blood vessels, permitting increased blood flow to the skin. Permits warming of the skin and facilitates radiation of warmth through cooling. involuntary.

Zoonotic

Disease that is transmitted to humans through contact with nonhuman animals.

Zygote

Cell formed by the union of an egg cell and a sperm cell. Contains full completement of chroms.

Acclimation

Least amount of physiological change
Occurs in shortest period of time (sometimes immediately)
Reversible once individual returns to original environment
Example: hyperventilation at high altitude; "goosebumps"

Alfred Russel Wallace

Man who also has some of the same ideas as Darwin. Convinced Darwin to publish. (Natural Selection)

Allen's Rule

In colder climate's short appendages are adaptive because they are more effective at preventing heat loss. Longer appendages in warmer climates promote heat loss.

Bergmann's Rule

Relationship to body mass or volume to surface area. Body size is greater in pop. that live in colder areas. As mass increases, relative amount of surface area decreases proportionately. Increased mass allows for greater heat retention.

Carolus Linnaeus

Came up with taxonomy. (Binomial Nomenclature system)

Charles Darwin

Nature "selects" those individuals whose traits better match the conditions of the environment
Individuals whose traits are a better match to the environment survive in greater numbers than those whose traits don't match as well
These favorable traits are passed on to offspring. Does not create new traits; traits must be inherited
Acts only on the variability that already exists in a population
Works only on traits that affect reproduction
Fitness is relative to the environment
If conditions of environment change beyond the abilities (existing traits) of population, it will become extinct
Extinction is the rule, NOT the exception

Charles Lyell

Geologist. Provided evidence for Uniformitarianism. Darwin's mentor.

Georges Cuvier

Opposed Lamarck's species change. Believed in fixity of species and came up with catastrophism.

Georges-Louis Leclerc de Buffon

Wrote Natural History. Recognized the external environment and living forms. Different regions have different pants and animals. Believed in a "center of origin" but not changes over time.

Jean-Baptiste Lamarck

Dynamic relationship between species and the environment. External forces changed, then animal's pattern changed to accommodate. Result in increased or decreased use of certain body parts. "fluids and forces" would be directed to the parts that needed it. New trait would be passed on to offspring. Neck of giraffe stretches, neck becomes progressively longer, long necked descendents after many gens.

Great Chain of Being

Ranking extended to ethnic and racial groups
"Typical" abilities (character, morals, intelligence, temperament, etc.) fixed
Since organisms "breed true" (determined by heredity) no change is possible
"Natural" inferiority/superiority of people is part of Divine Plan

John Ray

Strong supporter of empirical approach
Developed concept of "species"
Developed "binomial nomenclature"
still used in natural sciences today

Humoral Theory

Developed by the greeks and used in medicine. A way of diagnosing by bodily fluids in relation to temperament.

Thomas Malthus

Paper inspired Darwin and Wallace. Wasn't interested in species change but of limiting population growth. Pops. increase when resources are plentiful/lack of predators. World would be a constant source of misery and famine of the pop. want kept in check.
Populations that reproduce sexually have the potential to grow at an exponential rate
Arithmetic vs. exponential growth
No population can continue to grow at exponential rate indefinitely
Growth stopped by limited food supply
"Surplus" offspring die

Herbert Spencer

Coined the phrase survival of the fittest. Doesn't imply the toughest or meanest
In Darwin's terms refers simply to reproductive success
Fitness value of any trait depends on the environment--there are no absolutely fit traits

John Bodin

"Six Books of the Commonwealth"
"Method for Easy Comprehension of History"
Humoral-racial scheme:
Whites: predominance of phlegm
Asians: predominance of yellow bile
Africans: predominance of black bile
Indians: predominance of blood
As in original humoral theory, Bodin's scheme associates humoral-based races with characteristic temperaments:
Indians: (red skin/blood) are savage and warlike
Blacks: (black skin/black bile) are lethargic and slow-witted
Asians: (yellow skin/yellow bile) are cunning
Whites: (white skin/phlegm) are reflective and rational

Johan Blumenbach

First attempt at racial classification. 4-5 races.Based on cranial morphology.

Social Darwinism

is an ideology of society that seeks to apply biological concepts of Darwinism or of evolutionary theory to sociology and politics, often with the assumption that conflict between groups in society leads to social progress as superior groups outcompete inferior ones. Survival of the fittest bullshit.

Francis Galton

Cousin of Charles Darwin and the creator of Eugenics.

Franz Boas

Studied physical features (cephalic index) and culture of Sicilian immigrants
Followed up with same individuals 10 years later
Both culture and cephalic index had changed
Most notable changes between parents and children
Boas concluded that:
no relationship exists between race and culture
Even race changes with environment

James Watson & Francis Crick

Developed a structural and functional model of DNA.

Gregor Mendel

Monk that lived in the Czech Republic. Worked with garden peas to investigate height and color.

Mendelian Trait

Characteristics that are influenced by alleles at only one genetic locus. Ex. blood types ABO, sickle cell anemia.

Individuals

Member of a population.

Somatic Cells

all bodily cells except for sexual cells.

Chromosomal Mutation

Trisomy 21 - Down's Syndrome

Directional Selection

Pop. gene pool needs to change in a specific direction. Some alleles need must consisitantly become more common while others become less common.

Normalizing Selection

Pepppered moths.

Scientific Method

Science: the process of explaining natural phenomena
Hypothesis: provisional explanation requiring verification
Empirical: relying on experiment or observation
Data: facts from which conclusions can be drawn
Theory: a broad statement of scientific relationships or underlying principles that has been substantially verified through the testing of hypotheses; a tested explanation of facts

Why is sickle cell anemia important?

Best documented example of natural selection. It can kill people who have it, but selection favors it because it makes people resistant to malaria.

Evidence for Evolution

Peppered moths, cickle cell, and drug resistant bacteria.

Scientific Paradigm

Define a particular body of theory
Describe the appropriate methods of study
Help define the questions/issues that the science addresses

Shortcomings of Natural Selection

Some traits may be selected for even though they actually make survival more difficult
Some examples: tail of peacock or large antlers on bull elk
Fitness value: reproductive success enhanced by these traits
Darwin called this "Sexual Selection"

Primary Influences on Darwin

Erasmus Darwin, his grandfather
Uniformitarian geology (Lyell)
Adaptation from Lamarck & others
Thomas Malthus and population dynamics

Vitalism

Lamarck and his "fluids".

Race

cultural, skin color, humoral.

Human Biodiversity

Internal characteristics:
Blood chemistry
Vascular capacity
Lung capacity
Immunity to different diseases
Presence/absence of certain enzyme
External:
Skin color
Hair color and texture
Stature
Shape of certain teet

Physiological Plasticity

Acclimation
Acclimatization
Developmental acclimatization

Developmental Acclimitization

Most dramatic of levels of response
Takes longest to develop
Develops only during growth and development of individual
Irreversible
Example: barrel chest at high altitudes

Natural Theology

Focus still on ways of knowing God
Evolution of Evolution: Enlightenment (17th Century Europe)

DNA Inheritence

Sexual reproduction increases genetic variation through random assortment of genetic material
Each parent can produce 8 million possible combinations; together 70 trillion! making a person's DNA specific to them

Non disjunction

occurs when chromosomes don't separate during meiosis.
(ex. Trisomy 21/Down's Syndrome

Modern Synthesis

is a union of ideas from several biological specialties which provides a widely accepted account of evolution. It is also referred to as the new synthesis, the modern synthesis, the evolutionary synthesis, millennium synthesis and the neo-Darwinian synthesis.
The synthesis, produced between 1936 and 1947, reflects the consensus about how evolution proceeds.[1] The previous development of population genetics, between 1918 and 1932, was a stimulus, as it showed that Mendelian genetics was consistent with natural selection and gradual evolution. The synthesis is still, to a large extent, the current paradigm in evolutionary biology.[2]

Positive assortative mating

individuals of similar phenotypes mate more often than expected

Negative assortative mating

individuals of dissimilar phenotypes mate more often than expected

Hardy-Weinberg Equilibrium Theory

Compare the expected and observed genotype frequencies of a genetic trait controlled by a single locus (simple Mendelian trait) that has only 2 alleles. (A, a).

The frequency of the "A" allele is represented by "p".
The frequency of the "a" allele is represented by "q".

p + q = 1 (100% of all alleles for this trait in the gene pool)

To determine the expected frequencies of the possible genotypes, we compute the chances of alleles combining with one another in all possible combinations:

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

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