CELL REPRODUCTION

WHY DO CELLS DIVIDE? TO CREATE NEW CELLS TO REPLACE DEAD CELLS TO ALLOW GROWTH TO REPAIR DAMAGED OR INJURED CELLS

WHY MUST CELLS BE SMALL? CELLS CAN ONLY METABOLIZE AS THEY RECEIVE MATERIALS DIFFUSION IS SLOW AND INEFFICIENT OVER LONG DISTANCES, SO CELLS MUST BE SMALL

VOLUME INCREASES MUCH FASTER THAN SURFACE AREA SMALL SURFACE AREA CANNOT EFFICIENTLY TAKE IN OR REMOVE MATERIALS FROM A LARGE VOLUME.

CELL IS POISONED OR STARVES

2 TYPES OF REPRODUCTION ASEXUAL REPRODUCTION SEXUAL REPRODUCTION

ASEXUAL REPRODUCTION PRODUCING OFFSPRING FROM ONE PARENT PRODUCE AN EXACT COPY OF THE PARENT BECAUSE THE GENES ARE THE SAME

BINARY FISSION PRODUCTION OF 2 CELLS OF THE SAME SIZE. EXAMPLES: BACTERIA, ALGAE & PROTOZOA

SPORE FORMATION TINY ASEXUAL REPRODUCTIVE CELLS WITH A HARD OUTER WALL– DEVELOPS INTO A NEW ORGANISM EX: FUNGUS

BUDDING A SMALL BUD GROWS DIRECTLY FROM THE BODY OF THE PARENT AND LATER SEPARATES.

Brown hydra - Hydra oligactis - video 09.html - ARKive Brown hydra - Hydra oligactis - video 09.html - ARKive

VEGETATIVE PROPAGATION SMALL PLANTS FORM FROM ROOTS, STEMS, OR LEAVES OF OTHER PLANTS. EXAMPLES: STRAWBERRIES, POTATO & SPIDER PLANT

REGENERATION DEVELOPMENT OF A NEW ANIMAL FROM PART OF ANOTHER. STARFISH & JELLYFISH

SEXUAL REPRODUCTION TWO PARENTS PRODUCE OFFSPRING EACH CONTRIBUTES GENES (TRAITS) TO THE OFFSPRING

GAMETES – SEX CELLS FEMALE GAMETE + MALE GAMETE EGG CELLSPERM CHROMOSOME # 23 FERTILIZED EGG (ZYGOTE) CHROMOSOME # = 46 FERTILIZATION – IS THE PROCESS WHERE EGG & SPERM COMBINE TO FORM A ZYGOTE