Ch 11 Definitions 2

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Ch 11 Definitions 2
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Situation in which both alleles of a gene
contribute to the phenotype of the organism.
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Codominance
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Process in which homologous chromosomes exchange
portions of their chromatids during meiosis.
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Crossing-over
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Term used to refer to a cell that contains both
sets of homologous chromosomes.
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Diploid
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Diagram showing the relative locations of each
known gene on a particular chromosome.
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Gene map
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Cell that contains only a single set of
chromosomes and therefore only a singe set of
genes.
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Haploid
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Chromosomes that each have a corresponding
chromosome from the opposite-sex parent.
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Homologous
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Situation in which one allele is not dominant
over another.
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Incomplete dominance
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Segregation of genes during the formation of
gametes.
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Independent assortment
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Process of cell division by which the number of
chromosomes per cell is cut in half.
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Meiosis
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Three or more alleles of the same gene.
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Multiple alleles
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Trait controlled by two or more genes.
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Polygenic traits
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Structure containing four chromatids that forms
during meiosis.
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Tetrad
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end