Crossing over at prophase I results in the linked genes (those on the same chromosome) becoming unlinked and separated. Prophase I is this first stage of meiosis, the chromosomes condense, form tetrads<span>, and exchange DNA. The nucleolus and nuclear envelope disappear.</span>
A delta is formed by constructive erosion.
Aerobic respiration is producing of cellular energy involving oxygen.
Anaerobic respiration is respiration using electrons through molecular oxygen.
