if a human has an extra copy of one pair of homologous chromosomes, how many chromosomes will she have in total?

The DNA has replicated so there is a double copy of each of the 46 chromosomes (23 pairs of homologous chromosomes).

Well, both latitude and intensity of light affect temperature because, the higher the light intensity, the higher the temperature and since latitude is the measure of how close you are to the equator, then the closer to the equator you are, the higher the temperature is.