Maternal Effects and Genetic Inheritance

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Linkage

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Genes close together on same chromosome tend to be inherited together

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Maternal Effect

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When mothers genotype directly determines the offsprings phenotype for a trait

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Nurse Cells

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Maternal cells that provide mRNAs, proteins, and nutrients to developing eggs

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Epigenetic Inheritance

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Transmission of gene expression patterns (and thus phenotype)without changes in DNA sequence

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Dosage Compensation

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Mechanisms that equalize expression of X-linked genes between sexes

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Barr Body

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Condensed inactivated X chromosome found in female somatic cells

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X-inactivation

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Process of silencing all but one X chromosome in females

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Lyon hypothesis

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X-Inactivation in female mammals occurs randomly during early development

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Pseudoautosomal genes

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Gene on Sex chromosomes that are inherited like autosomal genes because they exist on both X and Y

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Genomic Imprinting

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Epigenetic mechanism causing mono allelic expression