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Terms for genetics and Mendel's four principles.

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Term
Definition
1.   Traits are inherited as discrete units. Biological inheritance is determined by factor that are passed from one generation to the next -- genes.  
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2. Principle of Dominance   Some alleles are dominant (trait is expressed) and some are recessive (trait is not expressed when dominant present).  
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3. Principle of Segregation   2 copies of each gene separate during gamete formation. (Each adult has 2 copies of each gene- one from each parent. These genes separate from each other when gametes are formed (during meiosis)).  
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4. Principle of Independent Assortment   Inheritance of one trait does not influence inheritance of another.  
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Homozygous   (Pure) Both alleles are the same.  
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Heterozygous   (Hybrid) Each allele is different.  
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Genotype   2 alleles (Aa, AA, aa).  
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Phenotype   Physical characteristic.  
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Allele   Different versions of a gene (A, a, B, b).  
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In a test cross to find the unknown genotype, use...   Pure/homozygous recessive.  
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Is this correct? WrWR   No, it isn't. This should be written as WWRr.  
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Gamete   A mature haploid male or female cell that is able to unite with another to form a zygote.  
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Diploid   A cell with paired chromosomes (before meiosis).  
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Haploid   A cell with half the chromosomes (after meiosis).  
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