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Bio I - Exam #4 Terms
Evolution, Origin of Species, Systematics, Biotechnology, Cellular Development, Evolution of Development
53
Biology
Undergraduate 1
12/04/2013

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Term
Industrial melanism
Definition
A process where organisms change their pigmentation in order to adapt to environments that are high in pollution.
Term
Directional selection
Definition
The change in beak shape in Darwin’s finches observed by the Grants is evidence for
Term
Stratigraphy
Definition
Branch of geology that studies rock layering and can be used to date fossils
Term
Homologous structures
Definition
The existence of shared ancestry between two structures as evidenced by similar development and anatomy.
Term
Paleoecology
Definition
Field of study that uses data from fossils to reconstruct the ecosystems of the past.
Term
Embryos
Definition
Diploid eukaryote in its earliest stage of development that contains various clues about evolution such as gill slits.
Term
Blastulas
Definition
Humans and Birds have similar
Term
Molecular homologies
Definition
Shared molecular traits such as in DNA and proteins that indicate shared ancestors. For example a Rhesus monkey's DNA is 95% similar to a human's.
Term
Biogeography
Definition
The study of the distribution of species in geographic space and through geological time. For example the domestication of cattle.
Term
Convergent Evolution
Definition
The independent evolution of similar features in species of different lineages.
Term
United States
Definition
A developed first world country that has a low acceptance of evolution.
Term
Phylogenetic species
Definition
A group of organisms that shares an ancestor. (monophyletic DNA)
Term
Biological species
Definition
Two organisms that are able to reproduce naturally to produce fertile offspring of both sexes.
Term
Ecological species
Definition
A group of organisms adapted to a particular set of sources, called a niche, in the environment.
Term
Agamospecies
Definition
Asexual species that share the same genome.
Term
Geographical Isolation
Definition
A type of prezygotic isolation mechanism where species occur in different areas, which are often separated by a physical barrier such as a river or mountain range.
Term
Ecological Isolation
Definition
A type pf prezygotic isolating mechanism where species occur in the same area but they occupy different habitats. Survival of hybrids is low because they are not adapted to either environment of their parents.
Term
Behavioral Isolation
Definition
A type of prezygotic isolating mechanism where species differ in their mating rituals.
Term
Temporal Isolation
Definition
A type of prezygotic isolating mechanism where species reproduce in different seasons or at different times of the day.
Term
Mechanical Isolation
Definition
Morphological impediments to successful mating between different species; often due to incompatible genital.
Term
Gametic Isolation
Definition
A type of isolation that prevents the fertilization that occurs after sperm release.
Term
Postzygotic isolation
Definition
Reproductive isolation mechanism that acts after the point of conception.
Term
Allopatric speciation
Definition
Separation of gene pools that follows a geographic separation of populations.
Term
Sympatric speciation
Definition
Separation without geographical isolation, of populations into different lineages. Often due to habitat isolation.
Term
Adaptive radiation
Definition
Evolutionary diversification of a lineage of organisms.
Term
Pentadactyl limb
Definition
The ancestral terrestrial vertebrates limb which has been subsequently adapted by modification for different uses/habitats.
Term
Evolutionary stasis
Definition
Phenomenon where an organism has undergone very little evolution throughout history possibly due to dominant survival features.
Term
Systematics
Definition
Study of how living things, especially species, are related to each other.
Term
Phylogeny
Definition
Description of the degree to which different species are related to each other.
Term
Hox gene family
Definition
A group of related genes that controls the body plan of the embryo.
Term
Recombinant DNA
Definition
Molecules of a single DNA molecule made from two different sources.
Term
Vector
Definition
A vehicle to carry the recombinant DNA molecule that can replicate in the host when it has been introduced.
Term
Biopharming
Definition
The process of inserting genes that code for useful pharmaceuticals into host animals, thus creating a genetically modified organism (GMO).
Term
Gene therapy
Definition
The use of DNA as a pharmaceutical agent to treat disease. For example inserting an immune system activation gene.
Term
Bioremediation
Definition
A waste management technique that involves the use of organisms to remove or neutralize pollutants from a contaminated site.
Term
Phytoremediation
Definition
Mitigating pollutant concentrations with plants that are able to contain, degrade, or eliminate the pollutants from the medium that contains them.
Term
Carbon sequestration
Definition
Process of storing carbon dioxide or other forms of Carbon to either mitigate or defer global warming.
Term
Ectoderm
Definition
One of the three primary germ cell layers; the most exterior or distal.
Term
Endoderm
Definition
One of the three primary germ cell layers; the innermost layer.
Term
Mesoderm
Definition
One of three primary germ cell layers; the middle layer between endoderm and ectoderm.
Term
Mesoderm
Definition
One of three primary germ cell layers; the middle layer between endoderm and ectoderm.
Term
Mycoplasma genitalium
Definition
A small parasitic bacterium found in primate genitals and respiratory tracts with the smallest known genome.
Term
Stem cell
Definition
Undifferentiated biological cells that can differentiate into specialized cells and reproduce through mitosis.
Term
Embryonic stem cell
Definition
Pluripotent stem cells derived from the innermass of a blastocyst; have the ability replicate indefinitely.
Term
Adult stem cells
Definition
Undifferentiated cells found throughout the body that multiply in order to replenish dying cells or regenerate damaged tissue. They can generate all of the cell types from the organ in which they originate.
Term
Totipotency
Definition
The ability of a cell divide and differentiate into all the different type of cells in an organism.
Term
Pluripotent stem cell
Definition
A stem cell that has the ability to differentiate into any of three different germ layers.
Term
Multipotency
Definition
Refers to progenitor cells which have the gene activation potential to differentiate into multiple but limited cell types.
Term
Differentiation
Definition
Process by which a less specialized cell becomes a more specialized cell type.
Term
Wnt signaling pathway
Definition
Pathway involved in all stages of differentiation. Passes signals from outside of a cell into the cell through cell surface receptors.
Term
Gastrulation
Definition
A phase early in the embryonic development of most animals, during which the single-layered blastula is reorganized into a three-layered structure known as the gastrula.
Term
Morphogenesis
Definition
The biological process that causes an organism to develop its shape.
Term
Apoptosis
Definition
The process of programmed cell death (PCD)
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