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Module 8 Vocab Exploring Creation with Biology

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Question
Answer
True breeding   When a certain characteristic is always passed on to offspring  
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Allele   One of a pair of genes that occupies the same position on homologous chromosomes  
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Genotype   Two-letter set that represents the alleles an organism possesses for a certain trait  
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Phenotype   Observable expression of an organism's genes  
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Homozygous genotype   Genotype in which both alleles are identical  
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Heterozygous genotype   Genotype with two different alleles  
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Dominant allele   Allele that will determine phenotype if just one is present in the genotype  
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Recessive allele   Allele that will not determine the phenotype unless the genotype is homozygous in that allele  
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Mendel's Principles of Genetics #1   The traits of an organism are determined by its genes.  
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Mendel's Principles of Genetics #2   Each organism has two alleles that make up the genotype for a given trait.  
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Mendel's Principles of Genetics #3   In sexual reproduction, each parent contributes only one of its alleles to the offspring.  
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Mendel's Principles of Genetics #4   In each genotype there is a dominant allele. If it exists in an organism the phenotype is determined by that allele.  
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Pedigree   Diagram that follows a particular phenotype through several generations.  
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Monohybrid cross   Cross between two individuals, concentrating on only one definable trait  
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Dihybrid cross   Cross between two individuals, concentrating on two definable traits  
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Autosomes   Chromosomes that do not determine the sex of an individual  
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Sex chromosomes   Chromosomes that determine the sex of an individual  
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Antigen   Protein that triggers the production of an antibody when introduced in the blood  
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Autosomal inheritance   Inheritance of a genetic trait not on a sex chromosome  
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Genetic disease carrier   Person who is heterozygous in a recessive genetic disorder  
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Sex-linked inheritance   Inheritance of a genetic trait located on the sex chromosomes  
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Mutation   Radical chemical change in one or more alleles  
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Change in chromosome structure   Situation in which a chromosome loses or gains genes during meiosis  
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Change in chromosome number   Situation in which abnormal cellular events in meiosis lead to either none of a particular chromosome in the gamete or more than one chromosome in the gamete  
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Created by: michelemegna
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