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Reproductive Strategies

Reproductive Strategies. Mitosis is the key mechanism for asexual reproduction Meiosis involves the production of gametes followed by fertilization. Reproduction in Prokaryotes. Bacteria and other prokaryotes have no nucleus, therefore, do not undergo mitosis.

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Reproductive Strategies

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  1. Reproductive Strategies • Mitosis is the key mechanism for asexual reproduction • Meiosis involves the production of gametes followed by fertilization.

  2. Reproduction in Prokaryotes • Bacteria and other prokaryotes have no nucleus, therefore, do not undergo mitosis. • They reproduce by binary fission. • The sequence of repeated doubling is called exponential growth. A bacteria can divide in as little as 20 minutes and produce two more cells 20 min. later.

  3. Asexual Reproduction Budding – a form in which a miniature version of the parent grows outside from the parent’s body. Vegetative reproduction – strawberry plants have runners that creates a new plant. Fragmentation – cultivation of potatoes Parthogenesis – an unfertilized egg develops into an adult.

  4. Alternation of Generations • The life cycle of plants consists of two generations: a haploid generation and a diploid generation that alternate. • Alternation of asexual reproduction examples…

  5. The Life Cycle of a fern

  6. The life cycle of moss

  7. The life cycle of a conifer

  8. The life cycle of a cnidarian – ALTERNATION OF SEXUAL CYCLE

  9. Advantages and Disadvantages of Reproduction Strategies • Sexual reproduction gives an opportunity for genetic variation. • Three potential advantages: • Offers a population a way to adapt to a changing environment • Competition among siblings may be reduced if they are genetically diverse • Pairing of homologous chromosomes and crossing over offer opportunities to replace or repair damaged chromosomes.

  10. Asexual Reproduction • Often proceeds more quickly than sexual reproduction • Usually requires less energy • Helps to maximize the changes that individual offspring will survive. • ____________________ • Each of the new individuals that have been reproduced, in either way, carries a set of genetic instructions that determines how members of the species will grow and develop.

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