Gas exchange occurs when a. oxygen in the alveoli diffuses into the blood in the capillaries b. oxygen binds with hemoglobin in the red blood cells
c. the red blood cells give up oxygen to the cells of the body tissues
d. All of the above

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A. Oxygen in the alveoli diffuses into the blood in the capillaries.

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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