Dominance

last updated by

Locus 17 years, 8 months ago

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- March 19, 2007 at 11:15 am #7214
  pankaaj
  Participant
  Has dominance evolved? I mean..wat is the exact concept of Dominance/recessive allel?
- March 19, 2007 at 2:58 pm #70220
  Darby
  Participant
  In some ways, you’re asking the wrong question.
  Recessiveness is the target here, since recessive alleles often code for proteins that don’t work properly, if at all.
  For instance, Mendel’s original tall-short alleles were a "normal" growth hormone allele, and an allele that produced a non-functioning version. With one OR two alleles present, growth hormone is produced and the plants grew to normal height; with two recessive alleles, no working growth hormone was made and the plants were very short.
- March 19, 2007 at 8:09 pm #70241
  Poison
  Participant
  We can not say "evolve" for dominance. Alleles are formed by mutations.
- March 31, 2007 at 9:54 am #70717
  pankaaj
  Participant
  Its like that only …only thing is that we dont call it evolution/adaptation..we call it dominance!
  Accordin to Hardy Weinberg equalibrium the removal of allele needs a lot of time and it is impossible in Natural Populations hence onlt recessive gets survived ( in the form of Heterozygots also)…
- March 31, 2007 at 5:17 pm #70729
  Darby
  Participant
  You’ve got a lot of concepts very confused.
  Hardy-Weinberg doesn’t say what you think it does – just the opposite, since the conditions for the continuation / elimination for alleles are mostly not features actually found in Nature.
  Also, dominance just addresses the likelihood of an allele being expressed observably – it’s what that allele’s protein does that’s important.
- April 1, 2007 at 6:29 pm #70765
  Locus
  Participant
  Why not? It is simply hard to observe and takes relative much time, and depend on the selection pressure.
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