| A | B |
|---|
| zygote | the cell porduced when a male gamet fuses with a female gamete |
| fertilizaion | the uniting of the male and female gametes |
| crossing over | the exchange of genetic material between homologous chromosomes |
| dihybrid | a cross involoving two traits |
| exocytosis | release of wastes or cell products from inside to outside a cell |
| osmosis | diffusion of water molecules through a selectively permeable membrane |
| gene | asegment of DNA that controls the production of a protein |
| hypertonic solution | concentration of dissolved substances outside the cell is higher than the concentration inside the cell |
| diffusion | movement of particles from an area of higher concentration to one oflower concentration |
| nucleus | the center of an atom |
| solution | mixture in which one substnce is distributed evenly in another |
| metabolism | all the chemical chanes that occur within an organism |
| peptide bond | bond formed between amino acids |
| enzyme | protein that speeds up a chemical reaction |
| polar molecule | molecule with unequal distribution of charge |
| polymer | large molecule formed when many smaller moleculesbond together |
| cellulose | glucose polymer that forms the cell walls of palnts |
| decomposer | breaks down dead organisms |
| heterotroph | obtains energyand nutrients from atutotrophs |
| trophic level | step in the passage of energy and amtter through an ecostystem |
