<span>in green plant cells a plastid that contains chlorophyll, and then which photosynthesis takes place.</span>
Answer: The nucleus.
Explanation: In an atom, there are two main parts, the nucleus and the electron cloud/electron shells. The protons and neutrons are located in the nucleus, and the electrons are located in the electron shells/cloud/whatever.
With chromosomes crossing over frequently, it's more likely that genetic defects will occur in offsprinfg.
