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17 Cards in this Set
- Front
- Back
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one of several alternative forms of a particular gene
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allele
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a genetic disorder caused by the presence of three copies of chromosome 21
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down syndrome
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an organism carrying 2 copies of the same allele of a gene
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homozygote
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an organism carrying 2 different alleles of a gene
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heterozygote
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a unit of heredity containing the information for a particular characteristic
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gene
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an error in meiosis in which chromosomes fail to segregate properly into the daughter cells
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non disjunction
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the genetic composition of an organism
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genotype
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the physical properties of an organism
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phenotype
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an individual heterozygous for a recessive condition
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carrier
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the physical location of a gene on a chromosome
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locus/loci
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the exchange of corresponding segments of the chromatids of two homologous chromosomes during meiosis
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crossing over
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allele that determines the phenotype of heterozygotes completely
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dominant
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allele is expressed only in homozygotes
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recessive
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true breeding variety
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homozygous
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cross between 2 hybrids
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dihybrid cross
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cross that involves 2 different gene pairs
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testcross
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cross with homozygous recessive to determine genotype of unknown
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phenotype
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