Why is one X-chromosome silent in females where both the X and the Y remain active in males? The X chromosomes contain exactly the same info so you only need one.

The X chromosome are exactly the same and you only need to use one at a time. The other one gets turned on later.

The X and Y chromosomes contain the same info but are used differently.

X and Y chromosomes contain different information so both need to remain active.

you know that this symptom is misleading and quite often is related to: heart attack

a heart attack is a condition that occurs when the blood flow that transports oxygen to the heart muscle is damaged or cut off completely. the coronary arteries that supply the heart muscle with blood flow can be blocked by the accumulation of plaque. also, when the plaque within the heart artery breaks, it creates blood clot that can also hinder the blood flow. men that are over 45years of age and women that are over 55years of age are at risk of having a heart attack. the symptoms of a heart attack include chest discomfort, chest pain, coughing, and shortness of breath.

yes

explanation

they do and it slaps