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Published byTimothy Sutton Modified over 9 years ago
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DO NOW: TAKE 4 HANDOUTS FORM FRONT 1. Take out Reinforcement Activity. 2. Take 2 colored pencils from the tray and sit quietly and write down HW HW : Complete the venn diagram Read pages 80-85 in textbook Study for Meiosis and Reproduction Quiz Bring in your journals (composition book) if you have not already done so.
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Why do genetics and heredity exist? Life is continuous because of reproduction & development. Reproduction is necessary for the survival of the species, but not the organism. There are two ways traits can be passed from parent to offspring.
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Asexual reproduction Requires only one parent Doesn’t involve sex cells (sperm & egg) Results in growth of another individual Offspring are clones of the parents (genetically identical) Ex: Paramecium Plants
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Sexual reproduction Requires two parents Involves specialized sex cells Results in the production of another individual Offspring are unique – not identical to parent Ex: Humans Plants Some organisms reproduce: asexually, sexually, or both ways.
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Methods of Asexual Reproduction : Budding - offspring grow out of the parent’s body Ex:Hydra Internal buds - release a mass of cells that develops internally Ex:Sea sponge
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Fragmentation – organism splits in half Ex: Planaria (worms) Regeneration - piece of the organism detaches & develops Ex:Starfish
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Method of Sexual Reproduction: Sex cells join to create a fertilized egg. (Draw in:
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Fertilization & development can occur internally or externally. Internal Fertilization Ex. Human, dogs External Fertilization Ex. Turtles, plants, snake, fish Internal Development Ex. Humans, monkey, cats External Development Ex. Chicken, lizard, fish, platypus, insects
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