Meiosis i is being stimulated with a pair of homologous that are red and yellow. why will one resulting daughter cell cintains only red-long and the other daughter cell contain only yellow-long? what occured if each dauggter cell contains a red and yellow-long?

In meiosis I, the pair of homologous chromosomes separate from each other so that the entire red-long homolog will move one direction and the entire yellow-long homolog will move in the other direction. 

If a cell ended up with both homologs, that would be the result of nondisjunction. The gametes formed from that cell will up with 2 copies of the long chromosome. The gametes formed from the other cell from meiosis I will end up with no copies of that chromosome.