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BMZ Lesson 1
BMZ Lesson 1: Introduction to Evolution
Question | Answer |
---|---|
Evolution | heritage change in one or more characteristics of a population from one generation to the next. things change through time, natual selection, genetic variation, |
Microevolution | evolution on a smaller scale, relating to changes in a single gene or allele frequencies in a population over time. |
Macroevolution | larger scale evolution in relation to the formation of new species or groups of related species. |
Discovery based science | collection and analysis of data without the need for a preconceived hypothesis. Often leads to hypothesis testing. |
Hypothesis Testing | creation of a hypothesis, testing, analyzing data, accept or reject hypothesis |
Theory | Developed through extensive testing and large amounts of data consistency with a vast amount of known data ability to make a correct prediction |
Charles Darwin (1809-1882) | played key role in developing the theory of evolution. |
Natural Selection | ACTS ON THE INDIVIDUAL |
EVOLUTION | ACTS ON THE POPULATION |
Homologous Structures | same components, common ancestor |
Convergent Evolution | Do NOT share a common ancestor but look alike |
Analogous | Similar environmental pressure, NOT COMMON ANCESTOR |
Natural Selection | Requires Variation, Inheritable, one has to reproduce faster than other. |
Lamark (1800) | You lose an arm, so does your offspring! AH! |
Alleles | variant forms of a particular gene |
Vestigial Structures | anatomical features that have no current function but resemble structures of their presumed ancestors. |
homologous genes | two or more genes are derived from the same ancestral gene |
phenotype | observable characteristic |
genotype | hereditary information, genetic make up |
Ultimate source of all genetic variation | mutation |
Gene Pools | complete set of unique alleles in a species or population |
Hardy Weinberg Theorem | 5 Conditions: 1. NOT evolve, should be infinitely large 2. random mating 3.no selection 4. no mutations 5. no migrations |
Founder Effect | In population genetics, the founder effect is the loss of genetic variation that occurs when a new population is established by a very small number of individuals from a larger population. |
Bottleneck Effect | is an evolutionary event in which a significant percentage of a population or species is killed or otherwise prevented from reproducing |
Types of Natural Selection | 1. Directional 2. Disruptive 3. Stabilizing 4. Balancing |
Sexual Selection | competition in terms of who is the better breader |
1859 | pubilshing darwins book about species |
Reproductive Isolation | prevents one species from breeding with another |
Prezygotic reproduction | habitat isolation temporal isolation (reproducing at different times of the year) behavioral isolation mechanical isolation (size prevention) gametic isolation |
postzygotic reproduction | hybrid viability (offspring die) hybrid fertility (output is low or 0) Hybrid Breakdown (works for one generation but then not others) |
gradualism | changes occur slowly in the form of gradual steps |
punctuated equilibrium | theory in evolutionary biology which proposes that most sexually reproducing species will experience little evolutionary change for most of their geological history, remaining in an extended state called stasis |
anagenesis | the evolution of species involving an entire population rather than a branching even |
cladogenesis | Cladogenesis is the process by which species split into two distinct species, |
allopatric speciation | seperated, possibly my geographical reasons, and thus creates two new species |
sympatric speciation | ranges overlap but still not together |