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Inheritance, Genetic Mapping, and Pedigree Terms

Inheritance, Genetic Mapping, and Pedigree Terms

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Carrier
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An organism that has inherited a genetic trait or mutation but does not show symptoms of the disease. However, they are able to pass the gene onto their offspring.
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Sex-Linked Gene
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Genes that are located on one of the two sex chromosomes (X or Y) in an organism.
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X Chromosome Inactivation
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A phenomenon in females (XX) in which one of the X chromosomes is silenced and the other is actively expressed.
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Incomplete Dominance
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When an organism that is heterozygous for a trait expresses a phenotype that is a mixture of its two alleles.
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Codominance
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A condition in which both alleles of a gene pair in a heterozygote are fully expressed, with neither one being dominant or recessive to the other.
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Polygenic Trait
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Singular traits or phenotypes that are actually controlled by the expression of multiple genes.
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Linkage Map
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A diagram that shows the location of genes in relation to one another in the genome. It can be used to to determine the recombination frequency of genes.
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Recombination Frequency
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The frequency with which a single chromosomal crossover will take place between two genes during Prophase I in Meiosis.
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Pedigree
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A chart used to analyze and predict specific phenotypes and genotypes across generations of a family.
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Karyotype
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The number and visual appearance of the chromosomes in the cell nuclei of an organism.
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XX
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The pair of sex chromosomes that code for the female gender.
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XY
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The pair of sex chromosomes that code for the male gender.
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The pedigree symbol for a male who expresses a specific phenotype..
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The pedigree symbol for a male who does not express a specific phenotype..
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The pedigree symbol for a male who is a carrier of a sex-linked gene.
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The pedigree symbol for a female who expresses a specific phenotype..
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The pedigree symbol for a female who does not express a specific phenotype..
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The pedigree symbol for a female who is a carrier of a sex-linked gene.
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