The digestion of ___ takes place in the stomach by the actions of enzymes operating at low pH. This digestion continues in the small intestine and the large molecules are broken down into ___.

1. Crossing over occurs during prophase I of meiosis I. This exchange of genetic material between non-sister chromatids results in new combination of genes.
2. The orientation of chromosomes during metaphase may result in the daughter cells recieving different chromosomes.
3. Random fertilization