Respuesta :
The statement “If a cell has two X chromosomes, XIST will become active in one of them, producing a special type of regulatory RNA molecule known as long noncoding RNA” is true.
X-inactivation occurs in female mammals in which one of the two X chromosomes is inactivated, a process called lyonization. During lyonization, the XIST gene becomes active on one of the X chromosomes, producing a special type of regulatory RNA molecule known as long noncoding RNA (lncRNA).
The XIST gene is located on the X chromosome and is responsible for initiating the process of X-inactivation. When XIST is expressed, it produces a large amount of lncRNA that coats the entire X chromosome, silencing its genes. This means that only one of the two X chromosomes is active during development, which prevents females from having twice the amount of gene activity compared to males.
XIST is an important gene for the proper functioning of mammalian cells. Without it, female mammals would have twice the amount of gene expression as males, leading to developmental and physiological problems. XIST also plays a role in the programming of stem cells, since it is expressed in embryonic stem cells and helps to keep them in a pluripotent state.
Learn more about XIST gene at :https://brainly.com/question/29417876
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