An example of this is to whether smoke cigarette or not. People smoke whenever they feel anxious with their activities but they were thinking that it is not a habit, but in the end, they will be used to it that is why they tend to forget how to live without smoking. This is the reason why they got addicted and to some serious problems with their health.
A sex-linked trait is a trait that is carried by the X chromosomes in females but it is not expressed(the phenotype). Females are only carriers because they have two copies of the X chromosome [one of them carries the trait and the other does not]. Males who inherit one copy of the X chromosome often get the trait (because the trait is in either one copy or the other of the X chromosome) and express it while their Y chromosome would became recessive. Thus, only males express sex-linked traits such as hemophilia or color blindness
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C. her cerebellum in the center of her brain started it by coordinating her muscle movements
