The diagram below shows the first four steps of meiosis. What is happening in the step labeled B?
Meiosis I
ABC
D
O A. Mitotic spindles and spindle fibers are forming.
B. Spindle fibers are moving the chromosomes to the center of the
cell.
C. Spindle fibers are pulling the tetrads apart.
O D. The chromosomes are copied and form tetrads.

yes? sounds right, but you didn’t ask a question.

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."

several tissues working together form an organ, and several organs together make up an organisms.

the group of cell that carries out special jobs are tissue.