Question 6
How does the offspring inherit the two chromosomes of a homologous pair?
The right answer is the one marked above.
One from the mother and the other from the father. So a child inherits 23 from the father and 23 from the mother, making 46.
This is what n + n = 2n means. If both came from one source there would be no reason to speak of a homologous pair at all.