About 10% because I know about 90-95% of DNA is junk DNA(doesnt perform serious function)
The most common cause is the accuracy of the measure instruments. And the observation of operator is also an important factor. That's why one measurement should do three times and use the average.
The same number of chromosomes 6 chromosomes each since the aim is to obtain identical cells just to increase its quantity
The answer that you multiply by to get your total
Star A is most likely to be blue because it is the hottest out of the 4 stars given