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Biology, 05.09.2019 21:30 morgan3346
How is the effective dosage of x-linked gene products balanced in placental mammals between females that carry two x chromosomes and males that carry only a single x chromosome?
> genes on the single male x chromosome are expressed at twice the rate of genes on the two female x chromosomes.
> only half of the genes on each x chromosome are expressed in female somatic cells.
> the paternally derived x chromosome is inactivated in all female somatic cells, so only the maternally derived x chromosome is expressed.
> one x chromosome is randomly inactivated in female somatic cells.
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