I need help with all of these and a explanation please someone please

Which process must a cell undergo top identical cells at the end of cell division

In fruit flies, gray bodies (g) are dominant over black bodies (g), and brown pigments (n) are dominant over yellow pigments (n). each individual possesses two alleles for each trait. if a fly that is homozygous dominant for both traits is crossed with a fly that is homozygous recessive for both traits, what is the predicted genotype of the offspring.

What are some possible short and long term medical concerns for crew members on longer space exploration trips