So we have the wing structure and the color and the wing structure and the color traits. So we know that during meiosis one, in our discussion on meiosis one, we said that during ProPhase one of meiosis, we have a process known as synapses taking place. So the synapses is basically the intertwining of the chromosomes. And when the chromosomes intertwined, when they overlap onto one another, we have crossing over taking place. And what crossing over is it's the exchange of genetic information of chromosomal pieces among two noncystochromatids. So, remember, these two are cystochromatids with respect to one another.