1-14 senescence

1-14 senescence - 1.Senescence -germ cells versus somatic...

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1.Senescence -germ cells versus somatic cells -reproduction by fission -paradox? 2. reproduction is costly 3. Optimal senescence senescence- decrease in reproduction. .. germ cell lines -produce sex cells & gametes. -produce offspring -must be able to survive indefinitely, potential to be immortal. -investment in repair is much higher. Somatic cell lines -cells that divide and differentiate so provide diff parts of our body - not involved in reproduction -only need to live for one generation senescence is inevitable because the germ cell line has potentially the possiblity to be immortal. Fission/budding- splitting body in two. producing vegetative shoots. Asexual organisms- no division of soma and germ cells. All of the cell lineages have to oppose the effects of senescence. Animals and plants that produce asexually dont show any signs of senescence.
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Why is senescence important? -its a dominant trait -it seems paradoxical. Natural selection tries to maximize reproduction. .. but senescence decreases this with age. Reproduction is Costly:
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1-14 senescence - 1.Senescence -germ cells versus somatic...

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