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asp 1-E GENETICS, HEREDITY, AND ORGANIZING LIFE

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WORDS TO KNOW
DEFINITIONS
Allele   A form of a gene that determines alternate forms of a trait  
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Ancestor   An earlier organism from which an individual or group has developed  
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Class   Group of related orders of organisms; division of a phylum  
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Classification   A system of grouping organisms based on similar features  
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Classify   To group together  
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Codominance   In heredity, when two genes are present for a trait and neither one is dominant nor recessive  
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Dominant   A gene or trait that always shows itself  
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Family   In classification, a grouping of related genera; a subdivision of order  
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Genotype   The genetic makeup of an individual organism  
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Genus   In classification, a group of related species; subdivision of family  
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Heterozygous   Having two different forms of a gene for the same trait; having a pair of non-identical alleles (Hybrid)  
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Homozygous   Having two identical genes for the same trait; having a pair of identical alleles (Pure)  
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Kingdom   In classification, the most general of the seven levels; currently, there are six  
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Order   In classification, a group of related families  
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Phenotype   Observable (expressed, can physically see) inherited traits  
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Phylum   A level of classification below kingdom; the broadest group with each kingdom  
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Polygenic traits   Traits that are determined by more than one gene  
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Punnett square   A chart used to calculate possible allele combinations  
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Recessive   A gene that is not expressed in the offspring; is represented by a lower case letter  
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Sex-linked   Any trait located on the X chromosome; usually carried by the female and expressed in the male; recessive  
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Species   Any group of organisms that can freely reproduce together and produce viable (fertile) offspring  
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Taxonomy   The system used to classify living things  
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Zygote   A fertilized egg that will develop into a multicellular organism; contains the 2n number of chromosomes; a product of sexual reproduction  
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