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X - X-Linked Inheritance Males inherit their X chromosome...

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X-Linked Inheritance Males inherit their X chromosome from their mother. Their Y chromosome comes from their father. A male, therefore, cannot pass an X-linked trait to his sons. Males inherit all of their X- linked traits from their mother. If a male inherits an X-linked recessive trait, it will be expressed because males do not have a homologous X chromosome. Females can be carriers of X-linked traits without expressing them because they might carry the dominant allele on the other X chromosome. For example, the following genotype will have a dominant phenotype: X A X a . Dosage Compensation Although females have twice as many X-linked genes, the amount of protein produced by these genes is the same in females as it is in males . Reduced protein production (called dosage compensation) occurs as a result of inactivating one X chromosome by coiling and condensing it. When condensed, it cannot be transcribed, that is, it cannot be used to produce mRNA.
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