Proceed though meiosis to anaphase 1 . Which chromosomes went up and which went down? Up : Down :

The upper chromosomes went up and lower chromosomes went down.

Explanation:

Anaphase 1 of meiosis, the chromosomes that are present at the upper side went up and move towards the pole while on the other hand, the chromosomes which are located at the lower side went down moves toward another pole. Both chromosomes remain attached to one another in anaphase 1 while in telophase I, the chromosomes arrive at opposite poles of the cell.

b.

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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