Biology 1406 Exam 4 Study Guide Ch. 12-17 questions with complete solutions

Biology 1406 Exam 4 Study Guide Ch. 12-17 questions with complete solutionsWhat happens in the G1 phase? - correct answer Normal activities of the cell What happens in the S phase? - correct answer DNA is replicated What happens in G2 phase? - correct answer Preparation of the cell to undergo mitosis: copying organelles, making proteins and ATP, copying centrosome What happens in prophase? - correct answer A cell's genetic material condenses, a spindle starts to form, and the nuclear envelope breaks down What happens in metaphase? - correct answer All chromsomes attached to the spindle on either side of the centromere, lined up at the equator What happens in anaphase? - correct answer Centromeres split, microtubules contract, chromosomes pulled apart to opposite poles. What happens in telophase? - correct answer Nuclear membrane reforms and chromosomes decondense. What happens in cytokinesis? - correct answer The cytoplasm (rest of the cell) divides into 2 new daughter cells. If the cell is an animal cell, a cleavage furrow forms. If the cell is a plant cell, a cell plate forms. What is nondisjunction? - correct answer Failure for chromosomes to separate properly during nuclear division. Give an example of a genetic condition caused by nondisjunction. - correct answer Down Syndrome