In people with sickle-cell disease, red blood cells break down, clump, and clog blood vessels. blood vessels and broken cells accumulate in the spleen. among other symptoms, this leads to physical weakness, heart failure, pain, and brain damage. such a suite of symptoms can be explained by

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.

the answer would be 2, if crossing over doesn’t occur 2 out of 4 of the daughter cells will have that allele.

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