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Genetics Chapter 1
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20
Biology
Undergraduate 1
01/18/2012

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Term
Three differences genetics are responsible for
Definition
Species, breeds and lines and races, and individuals (partially).
Term
Three divisions of genetics and their definitions
Definition
Transmission (Classical) Genetics: encompasses basic principles of heredity or genetics and how those traits are passed on.
Molecular Genetics: Study of the chemical nature of genetics information and how it is encoded, replicated, and expressed. Includes cellular processes of replication, transcription, and translation.
Population (Evolutionary) Genetics: Study of genetic composition of populations (groups of members of the same species) and how population's collective group of genes changes with the passage of time.
Term
Genome
Definition
Complete set of genetic instructions for any organism.
Term
Model genetic organism
Definition
Organisms having characteristics that make them useful for genetic analysis and about which we know a lot of genetic info. about them.
Term
What are aspects of model genetic organisms?
Definition
Short generation time, manageable numbers of progeny, adaptibility to laboratory environment, ability to be housed and propagated inexpensively.
Term
Pangenesis
Definition
Early concept of heredity; particles carry genetic info. from different parts of body to reproductive organs.
Term
Inheritance of acquired characteristics
Definition
Traits acquired in one's lifetime become incorporated into one's hereditary information and are passed on to offspring.
Term
Preformationism
Definition
Inside egg or sperm exists tiny miniature adult (tiny adult called homunculous) which enlarges during development.
Term
Blending inheritance
Definition
Offspring are blend or mixture of parental traits.
Term
Cell Theory
Definition
Proposed by Schleiden and Schwann; All life is composed of cells, cells arise only form preexisting cells, and cell is fundamental unit of structure and function in living organisims.
Term
Germ-plasm theory
Definition
Proposed by Weismann; cells in the reproductive organs carry a complex set of genetic information that is passed to the egg and sperm.
Term
gene
Definition
fundamental unit of heredty, a unit of information that determines an inherited characteristic.
Term
chromosome
Definition
a structure consisting of DNA and associated proteins that carries a linear array of genes.
Term
DNA
Definition
deoxyribonucleic acid, the molecule that encodes genetic information in the form of ACGT.
Term
RNA
Definition
ribonucleic acid; encodes genetic information through the sequence of bases A, C, G, and U.
Term
genetics
Definition
the science of heredity.
Term
genotype
Definition
the genetic information that an individual possesses that determines a trait.
Term
phenotype
Definition
trait expressed by an individual.
Term
mutation
Definition
heritable alteration in the genotype of the individual, brought about by permanent alteration in the DNA.
Term
evolution
Definition
genetic change in a species or population.
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