You are looking through a microscope at onion cells and you see a cell with the sister chromatids lined up across the middle of the cell. what phase of mitosis are you observing?

answer: a. a gene that causes a specific trait.

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

i hope this