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19 Cards in this Set
- Front
- Back
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Allele
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One of a pair of genes that occupies the same position on homologous chromosomes
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Autosomal inheritance
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Inheritance of a genetic trait not on a sex chromosome
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Autosomes
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Chromosomes that do not determine the sex of an individual
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Change in chromosome number
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A 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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Change in chromosome structure
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A situation in which the chromosome loses or gains genes during meiosis
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Dihybrid cross
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A cross between two individuals concentrating on two definable traits
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Dominant allele
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An allele that will determine phenotype if even one is present in the genotype
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Genetic disease carrier
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A person who is heterozygous in a recessive genetic disorder
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Genotype
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Two-letter set that represents the alleles an organism possesses for a certain trait
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Heterozygous genotype
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A genotype with two different allele
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Homozygous genotype
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A genotype in which both alleles are identical
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Monohybrid cross
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A cross between two individuals concentrating on only one definable trait
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Mutation
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A radical chemical change in one or more alleles
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Pedigree
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A diagram that follows a particular species' phenotype through several generations
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Phenotype
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The observable expression of an organism's genes
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Recessive allele
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An allele that will not determine the phenotype unless the genotype is hornozygous with that allele
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Sex chromosomes
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Chromosomes that determine the sex of an individual
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Sex-linked inheritance
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Inheritance of a genetic trait located on the sex
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True breeding
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f an organism has a certain characteristic that is always passed on to all of its offspring, we say that this organism bred true with respect to that characteristic.
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