Why do Sex cells carry only one gene for color of your eyes even though you need two genes (pair of genes or alleles that determine the same characteristics)? Use the word bank to fill in the blank: Wordbank: Homologous chromosomes, Meiosis Alleles (also called alternative form of a gene) are the genes that are found on a and they separate at the time of , because sex cells can have only half the number of chromosomes found in an organism. Can someone help me please.