Apex Learning Biology Semester 2 Unit 4.1
Terms in this set (27)
The process in which humans select organisms with desirable traits and cause them to reproduce.
The result after a random occurrence causes a population to shrink rapidly and change it's allele frequencies. Example: A natural disaster can cause bottleneck effect.
An organism from which two or more species evolved.
Natural selection or sexual selection that selects for organisms with one extreme in a range of phenotypes.
Natural selection or sexual selection that selects for organisms with either extreme in a range of phenotypes.
The process of the traits of a population of organisms changing over many generations.
An actual remaining part or mark that shows evidence of an organism that lived in the distant past.
The orderly collection of all known fossils that have existed throughout life's history.
The result after a small group of a population separates and forms a new population with allele frequencies different from those of the original population.
The exchange of genes between species, or between different populations of the same species, due to immigration or emigration.
The arrangement of nucleotides in DNA or RNA that translates into the order of amino acids used to make proteins.
The variety of alleles and genotypes in a population
Changes from generation to generation in allele frequncies (the percentage of a specific version of a gene) that result from random processes.
A physically similar structure that performs different functions in different species.
A fossil that is found in rocks of only one particular time period example: Trilobite fossils.
One of several forms of an element, each with different number of neutrons.
An event in which at least 60 percent of the species living on earth becomes extinct at a particular time.
A trait controlled by two or more genes Ex: height
A method of determining the age of an object by measuring the amount of a radioactive isotope it contains.
Estimating the age of an object by comparing it to something else.
Particles of sand, mud, shell, clay, and so forth that settle at the bottom of bodies of water.
Layered rock formed from accumulated sand, mud, clay, and other sediment at the bottom of oceans, lakes, and rivers. Fossils are often found in sedimentary rock on land that was once covered by water.
Factors that give some organisms in a population the opportunity and deny that opportunity to others. EX: Natural selection, sexual selection.
The method animals use to attract males to reproduce.
Selection, either natural or sexual, that selects against organisms with extreme phenotypes. The result of stabilizing selection is a population with intermediate traits.
An idea supported by scientific evidence
A structure in an organism that has lost all or most of the original function it had for an ancestor EX: A whale's pelvic bone.
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