The answer is all of these occur. The tetrads need to be made before crossing over occurs, which only occurs in prophase 1. That automatically means it has to be all of the above.
When a doctor refuses to care for a certain patient. This can be for numerous reasons, maybe they are not fit to undergo a surgery of some sort, or are being problematic. Either or the doctor nor the patient benefit form this. Doctor misses out on someone to help (i assume that’s the attitude of one working for the greater good) and the patient misses the opportunity to possibly get the help they need.
Theodor Schwann
---> Theodor Schwann died aged 71 while visiting his sister in Cologne on January 11, 1882.<span>
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----> After all of his early success Schwann did little active research. In 1848 he was called to the University of Liege, where he remained till his death. In 1875 he published an indignant pamphlet denouncing the Catholic clergy for claiming that he testified in favor of the miraculous nature of the appearance of stigmata on Louise Lateau and he died in 1882 at the age of 72.
Because the mother cell has divided to give two new daughter cells.
