Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.


Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.

Remove ads
Don't know
Know
remaining cards
Save
0:01
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
Retries:
restart all cards




share
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Evolution

Basic, Beyond Basic and Lab Terms

TermDefinition
evolution the change in allele frequency of a population over time [B]
natural selection the process by which organisms that are better adapted to their environment are more likely to survive and reproduce (mechanism for evolution) [B]
adaptation a genetic variation (expressed as a trait) that is favored by selection in a particular environment [B}
species diversity the number of different species in a particular area [B]
limited resources less available food, water or space than is required by a population (above the carrying capacity) [B]
competition struggle for existence between organisms for mates or limited resources (winners are more fit, better adapted) [B]
genetic variation the difference in alleles or genes between organisms within the gene pool of a species [B]
mutation this change in DNA (nucleotide sequence) is the original source of variation [B]
genotype and phenotype 1) the 2 alleles (ex: Ww) for a trait 2) the expression of a trait (ex: widow's peak) [B]
speciation the formation of a new species following reproductive isolation (results in species diversity) [B]
evidence of evolution includes, but is not limited to fossil record, morphological homologies and DNA/protein similarities [B]
common ancestor an ancestral species shared by two or more species as evidenced by commonalities (can be shown on a phylogenetic tree or cladogram) [B]
genetic drift changes in the gene pool of a small population due to chance (examples include a bottleneck and the founder effect) [BB]
radioactive dating a method of determining the age of fossils and rocks using half-lives of radioactive isotopes (example: carbon dating) [BB]
mutagen causes mutations in DNA (includes radiation, some metals and biological agents) [BB]
heterozygous advantage preserves variation in gene pools by greater reproductive success in heterozygotes over individuals homozygous for either of the associated alleles (example: sickle cell allele and malaria resistance) [BB]
reproductive isolation two populations whose members are distinct species since they are blocked from interbreeding and producing fertile offspring (example: geographical isolation) [BB]
gene pool the total collection of genes in a population at any one time [BB]
Charles Darwin an English naturalist and geologist, best known for his contributions to evolutionary theory [BB]
evolutionary fitness for each individual this is measured by reproductive success due to use of inherited adaptations [BB]
extinction the end of life for all members of a species (a lack of genetic variation can increase the chance of this occurring) [BB]
morphological homologies similarity between two species in their form and structure of the whole organisms or their parts (including vestigial organs) [BB]
adaptive radiation the emergence of numerous species from a common ancestor introduced into an environment (often seen on islands) [BB]
Miller-Urey experiment showed the possibility of making complex organic molecules from inorganic molecules in the simulated conditions (as understood in 1953) of early Earth. [BB]
Hardy-Weinberg equilibrium the absence of evolution if all of the following 5 conditions are true: large populations, no mutations, no migration, random mating and no selection [Lab: Mathematical Modeling]
Hardy-Weinberg equations p2 + 2pq + q2 = 1 and p + q = 1 [Lab: Mathematical Modeling]
q allele frequency of the recessive allele (or second allele) in a population [Lab: Mathematical Modeling]
p allele frequency of the dominant allele (or first allele) in a population [Lab: Mathematical Modeling]
2pq the frequency of the heterozygous genotype in a population [Lab: Mathematical Modeling]
p2 the frequency of the homozygous dominant genotype in a population [Lab: Mathematical Modeling]
q2 the frequency of the homozygous recessive genotype in a population [Lab: Mathematical Modeling]
allele frequency The proportion of a particular allele in a population (written as a decimal) [Lab: Mathematical Modeling]
artificial selection The selective breeding of domesticated plants and animals to encourage the occurrence of desirable traits. [Lab: Artificial Selection]
bar graph uses rectangles of different heights to characterize data that is categorical (example: # of plants with different ranges of trichomes) [Lab: Artificial Selection]
trichomes hair-like structures found on plants (functions include, defense, lowering plant temperature and water absorption) [Lab: Artificial Selection]
directional selection a type of natural selection for a multigenic trait that favors individuals on one end of the phenotypic range (graphically shown as shift to the left or right) [Lab: Artificial Selection]
inherited trait a trait or characteristic that is passed through DNA from one generation to the next [Lab: Artificial Selection]
life cycle The entire sequence of stages in the life of an organism, from the adults of one generation to the adults of the next [Lab: Artificial Selection]
generation all individuals of a species born and living at about the same time (examples: P, F1, F2, etc.), [Lab: Artificial Selection]
BLAST a program that searches for regions of similarity between a biological sequence (DNA or proteins) and a genome database of many species [Lab: BLAST]
cladogram phylogenetic tree that branches repeatedly, suggesting a classification of organisms based on the time sequence in which evolutionary branches arise. [Lab: BLAST]
derived characteristics a trait that is shared by organisms with a recent common ancestor. (can be listed on a cladogram) [Lab: BLAST]
morphological characteristics traits that refer to structure or form such as shape, length or color of the body [Lab: BLAST]
DNA comparison a percent comparison of the DNA code of genes between two different species (can use BLAST) [Lab: BLAST]
protein comparison a percent comparison of the proteins between two different species (can use BLAST) [Lab: BLAST]
nucleotide sequence the order of the nucleotides (A,G,T and C) within a gene [Lab: BLAST]
Created by: cfigueiredo