In fruit flies, dominant gene “R” produces red eyes and rece…

In fruit flies, dominant gene “R” produces red eyes and recessive gene “r” produces white eyes.   Also, the R and r alleles are sex-linked (they are part of the X chromosome but not the Y chromosome or the autosomes).   Which mating below gives offspring that all have red eyes and all females are carriers of the white eyes gene?

Consider these events in mitotic cell division: Cleavage fu…

Consider these events in mitotic cell division: Cleavage furrow forms. Nuclear envelope (membrane) breaks down. Sister chromatids separate. Chromatin condenses into chromosomes. Chromosomes align at the equator. Nuclear envelope (membrane) forms. Which event occurs the earliest?