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

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Presentation on theme: "CELL REPRODUCTION. WHY DO CELLS DIVIDE? TO CREATE NEW CELLS TO REPLACE DEAD CELLS TO ALLOW GROWTH TO REPAIR DAMAGED OR INJURED CELLS."— Presentation transcript:

1 CELL REPRODUCTION

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

3 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

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

5 CELL IS POISONED OR STARVES

6 2 TYPES OF REPRODUCTION ASEXUAL REPRODUCTION SEXUAL REPRODUCTION

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

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

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

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

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

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

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

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

18 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


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