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Unit 6 - Genetics

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Term
Definition
trait   a characteristic that is passed from parent to offspring through the genes  
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allele   One or more alternate forms of a gene  
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amino acid   The subunit of a protein  
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anticodon   Three bases on a tRNA molecule that match up with the codons  
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biotechnology   the process of choosing a few organisms with desirable traits to serve as the parents of the next generation  
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chromosome   Compact structure of tightly coiled DNA within the nucleus containing the genetic information that is passed from one generation of cells to the next.  
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clone   an organism that is genetically identical to the organism from which it was produced  
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cloning   The creation of an organism that is an exact genetic copy of another  
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codon   A unit in messenger RNA consisting of a set of three consecutive nucleotides that specifies a particular amino acid in protein synthesis  
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DNA   A nucleic acid molecule in the form double helix that is the major component of chromosomes and carries genetic information  
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dominant   A trait that will appear in the offspring if one of the parents contributes it  
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electrophoresis   A process in which fragments of DNA are sorted by size. Used to determine relatedness among organisms  
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expressed   a set of technologies that humans use to alter the genetic instructions of an organism by substituting DNA molecules  
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gene   a segment of DNA (on a chromosome) that contains the code for a specific trait  
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gene   Sequence of DNA that codes for a protein and thus determines a trait  
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genetic engineering   Process of making changes in the DNA code of living organisms.  
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genetic recombination   the formation of a new combination of genes during sexual reproduction  
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genotype   Genetic make up of an organism; the genome  
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heredity   the passing of traits from parent to offspring  
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heterozygous   Refers to an organism that has two different alleles for the same trait.  
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homozygous   Refers to an organism that has two identical alleles for a particular trait.  
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hybrid   The offspring produced by crossing two individuals with different traits  
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mutation   Change in a DNA sequence that affects genetic information. Leads to genetic variation.  
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nucleotide   Building Block of a nucleic acid. Composed of a sugar, phosphate and a base  
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phenotype   Physical characteristics of an organism; the part of genetics that is seen  
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recessive   Describes an allele that is not expressed in heterozygous individuals. Must have two recessive alleles in order for the gene to be expressed  
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recombinant DNA   Molecule formed when fragments of DNA from two or more different organisms are spliced together.  
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replicate   to copy the pattern for a new molecule  
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RNA – Ribonucleic Acid   A nucleic acid composed of a long  
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sex-linked gene   Gene located on the X chromosome. Males tend to inherit sex-linked traits  
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sexual reproduction   a method of reproduction that involves two parents producing offspring that are genetically different from either parent  
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subunit   the section of a DNA molecule that contains a sugar  
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template   any alteration in the sequence of DNA  
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transcription   Process in which a portion of DNA (a gene) is copied into complementary RNA (mRNA)  
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translation   Decoding of mRNA into a polypeptide chain. Occurs at the ribosome  
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