It is believed that mitchondrial DNA (mtDNA) follows a non-Mendelian inheritance pattern. It is hypothesized that all mitochondria are inherited from the egg, and the sperm cell does not contribute mitochondria to the fertilized egg.
Which of the following experimental procedures would be the best method to test this theory?
Test the mtDNA of random flies to determine if all flies have the same mtDNA
Mate a specific fly, and test the mtDNA of both a male and female offspring to see if the mtDNA is identical to the
mother.
Mate a specific female fly, and select a male and female offspring. Mate them with each other and test the mtDNA of
the "grandchildren."
O Mate a female fly, and mate the offspring with unrelated flies with different mtDNA. Test the mtDNA of the
"grandchildren."

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

hypoxemia refers to a below usual concentration of oxygen in the blood, mainly in the arteries. hypoxemia is an indication of an issue associated with circulation or breathing and may lead to various symptoms like shortness of breath.  

the condition is identified by determining the level of oxygen in the blood sample obtained from an artery. it can also be predicted by determining the oxygen saturation of the blood with the application of a pulse oximeter.  

the normal arterial oxygen is about 75 to 100 mm hg. the values underneath 60 mm hg is generally considered with the requirement for supplemental oxygen. the normal pulse oximeter readings generally range between 95 to 100 percent. the values under 90 percent are regarded as low.  

in the given case, the oxygen saturation is measured at 93 percent, hence, there is no need to administer oxygen, that is, one should withhold oxygen.