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Genetics Vocab

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Term
Definition
1. heredity   the passing of genetic traits from parent to offspring  
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2. Genetics   the science of heredity and of the mechanisms by which traits are passed from parents to offspring  
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3. monohybrid   a cross between individuals that involves one pair of contrasting traits  
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4. P generation   parental generation, the first two individuals that mate in a genetic cross  
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5. F1 generation   the first generation of offspring obtained from an experimental cross of two organisms  
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6. F2 generation   the second generation of offspring, obtained from an experimental cross of two organisms; the offspring of the F1 generation  
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7. allele   one of the alternative forms of a gene that governs a characteristic, such as hair color  
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8. dominant   the expressed form of a trait  
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9. recessive   the trait that is not expressed when the dominant form of the trait was present  
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10. homozygous   describes an individual that has identical alleles for a trait on both homologous chromosomes  
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11. heterozygous   describes an individual that has two different alleles for a trait  
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12. genotype   the entire genetic makeup of an organism; also the combination of genes for one or more specific traits  
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13. phenotype   an organism's appearance or other detectable characteristic that results from the organism's genotype and the environment  
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14. law of segregation   Mendel's law that states that the pairs of homologous chromosomes separate in meiosis so that only one chromosome from each pair is present in each gamete  
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15. law of independent assortment   the law that states that genes separate independently of one another in meiosis  
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16. Punnett square   a graphic used to predict the results of a genetic cross  
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17. test cross   the crossing of an individual of unknown genotype with a homozygous recessive individual to determine the unknown genotypes  
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18. probability   the likelihood that a possible future event will occur in any given instance of the event; the mathematical ratio of the number of times one outcome of any event is likely to occur to the number of possible outcomes of the event  
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19. pedigree   a diagram that shows the occurrence of a genetic trait in several generations of a family  
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20. sex-linked traits   a trait that is determined by a gene found on one of the sex chromosomes, such as the X chromosomes or the Y chromosomes in humans  
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21. polygenic trait   a characteristic of an organism that is determined by many genes  
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22. incomplete dominance   a condition in which a trait in an individual is intermediate between the phenotype of the individual's two parents because the dominant allele is unable to express itself fully  
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23. multiple alleles   more than two alleles (versions of a gene) for a genetic trait  
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24. codominance   a condition in which both alleles for a gene are fully expressed  
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25. vaccine   substance prepared from killed or weakened pathogens and introduced into a body to produce immunity  
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