Question

8 why is meiosis crucial during development? a it creates genetic variation in offspring. b it ensures that cells divide correctly to form tissues and organs. c it leads to the formation of mutations in the embryo. d it triggers cell death in tissues. 9 during which phase of mitosis do chromosomes align at the cells equator? a prophase b anaphase c telophase d metaphase 10 what can result from the improper distribution of chromosomes during mitosis in an embryo? a developmental abnormalities or birth defects b increased mitotic rate c reduced cell size d enhanced tissue growth 11 how does osmosis differ from simple diffusion? a osmosis specifically involves the movement of water molecules. b osmosis requires energy input. c osmosis occurs against a concentration gradient. d osmosis involves the movement of proteins across the membrane. 12 what is the role of the cell membrane in maintaining homeostasis? a it synthesizes proteins necessary for cellular function. b it provides energy for cellular activities. c it stores genetic material for cell division. d it controls the entry and exit of substances, maintaining the internal balance of the cell. 13 what role do aquaporins play in the cell membrane? a they allow water molecules to pass through the membrane. b they store genetic information. c they pump ions against their concentration gradient. d they are involved in the breakdown of atp. 14 what is the role of the protein p53 in mitosis? a it forms the nuclear envelope. b it releases cytokines. c it stabilizes human non - chromosomes. d it prevents cells with damaged dna from undergoing mitosis.

Explanation:

1. Meiosis creates genetic variation in offspring through processes like crossing - over and independent assortment. This is crucial for evolution and adaptation.
2. Chromosomes align at the cell's equator during metaphase of mitosis. This ensures equal distribution of genetic material to daughter cells.
3. Improper distribution of chromosomes during meiosis in an embryo can lead to developmental abnormalities or birth defects due to an abnormal number of chromosomes (aneuploidy).
4. Osmosis specifically involves the movement of water molecules across a semi - permeable membrane from an area of high water potential to low water potential.
5. The cell membrane controls the entry and exit of substances, maintaining homeostasis by regulating the internal balance of the cell.
6. Aquaporins are channel proteins that allow water molecules to pass through the cell membrane.
7. The protein p53 prevents cells with damaged DNA from undergoing mitosis, acting as a tumor - suppressor protein.

Answer:

1. a. It creates genetic variation in offspring.
2. d. Metaphase
3. a. Developmental abnormalities or birth defects
4. a. Osmosis specifically involves the movement of water molecules.
5. d. It controls the entry and exit of substances, maintaining the internal balance of the cell.
6. a. They allow water molecules to pass through the membrane.
7. d. It prevents cells with damaged DNA from undergoing mitosis.