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Autosomal Dominant Diseases: Locus beta, 1 gene 2 Alleles A
Autosomal Dominant Diseases: Locus beta, 1 gene 2 Alleles A

... Insufficient protein production as a result of hemizygous or haploid gene when the  normal phenotype requires two alleles. The single copy of a gene does not provide  enough potential for normal protein production.  The situation in which an individual who is heterozygous for a certain gene mutation ...
Scientists have observed that when double
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Inheritance of Traits: Pedigrees and Genetic Disorders
Inheritance of Traits: Pedigrees and Genetic Disorders

... how a trait is inherited over several generations  Pedigrees are usually used when parents want to know if they are carriers of a particular disorder ...
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X-inactivation



X-inactivation (also called lyonization) is a process by which one of the two copies of the X chromosome present in female mammals is inactivated. The inactive X chromosome is silenced by its being packaged in such a way that it has a transcriptionally inactive structure called heterochromatin. As nearly all female mammals have two X chromosomes, X-inactivation prevents them from having twice as many X chromosome gene products as males, who only possess a single copy of the X chromosome (see dosage compensation). The choice of which X chromosome will be inactivated is random in placental mammals such as humans, but once an X chromosome is inactivated it will remain inactive throughout the lifetime of the cell and its descendants in the organism. Unlike the random X-inactivation in placental mammals, inactivation in marsupials applies exclusively to the paternally derived X chromosome.
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