Anonymous
Anonymous asked in Science & MathematicsBotany · 1 decade ago

Biology homework help? Bacterial reproduction.?

1. The reason why the bacterial cell divides is because...

2.Bacteria were around for a billion years or more before 'higher' organisms appeared. Why did it take so long for higher organisms to appear?

3. Most eukaryotic organisms participate in sex that is very different from bacterial sex. Explain what the major difference is and how this difference has allowed for speciation to occur.

Thanks in advance

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  • 1 decade ago
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    This isn't a Botany question. It should probably be in the Biology category.

    1. That is how bacteria reproduce. Reproduction is a requirement of life.

    2. Evolution is slow and takes time. It took a long time for the conditions of the earth to reach what we would consider 'habitable' to our kind of life. Without sexual reproduction, or without much of it (to a degree, bacteria may transfer genes to other, non-daughter bacteria), while individual mutations and beneficial changes could occur, they couldn't mix together. Sexual reproduction is much more effective for evolution.

    Multicellular (not colonial) organisms require many different things than single celled organisms and it took a long time for those structures to arise. Eukaryotes possessed these traits (eventually) and gave rise to multicellular organisms.

    This may not be the answer you need for your homework, so I suggest you consult your text. It probably lists certain points you'll be expected to be able to regurgitate.

    3. The sex in bacteria tends be a sporadic proccess. I believe it tends to happen when a population is put under stress, like insufficient food or an increase in toxins. Sex in eukaryotes, however, tends to be a regular process and is often (usuallY?) the method in which they reproduce. I know many plants can reproduce from cuttings or when parts of their roots are broken off as when people try to tear out weeds.

    Sex allows sharing of genetic information and thus, rapid evolution. A traditional definition of species is of a population that can interbreed, where as those of other species cannot interbreed with them. This probably isn't the answer you're looking for, though. In asexual reproduction, the new genes required for speciation (the breaking off of populations to form new species) must happen all within one line of organisms. In sexual organisms, an entire population can contribute to the pool of genetic material and share it through sex. The entire population will thus pool their genes (gene pool) and evolve together. This is the usually way in which new species occur in sexually reproducing organisms. Another way is when an incorrect number of genes gets passed on, polypoloidy, and this organism is unable to reproduce with others of the species is parents belonged to. This often leads to new species in plants (the plant may be able to reproduce with itself or reproduce asexually or, by luck, happen to be polinated or polinate another identically poliploidy plant).

    There's more to it... I'm sure you get the idea.

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