Left-hand or right-hand is not from genes, lobster

送交者: blobfish 于 2009-11-24, 09:12:54:

lobster's claws are similar to we human: right-hand and right-hand. One of the claw is bigger and powerful than the other and it can be used to crush, fight and wave signals. This is called asymmetry. Whether left claw or right claw can grow up to the crush one depends on the environment, i.e., stimulation, so 50% of the lobster are left-claw. Most of all, asymmetry is not inherent from genes.

所有跟贴:

I guess this doesn't apply to fiddler crabs, which are always right-clawed. (无内容) - tinaliang (0 bytes) 2009-11-24, 09:16:56 (389625)
- there's left hand ones - blobfish (46 bytes) 2009-11-24, 09:22:39 (389627)
  - thanks, is this also random? - tinaliang (67 bytes) 2009-11-24, 09:24:31 (389628)
    - it is random, but depends on selection - blobfish (184 bytes) 2009-11-24, 09:29:45 (389631)
      - wait a minute, are you saying snails of the same species screws differently? (无内容) - tinaliang (0 bytes) 2009-11-24, 09:33:35 (389635)
        
        Shell snails and shell fishes all have different skews: chirality (无内容) - blobfish (0 bytes) 2009-11-24, 09:43:25 (389640)
        
        and you claim you don't know biology? (无内容) - tinaliang (0 bytes) 2009-11-24, 09:46:17 (389641)
        
        this is symmetry done by physicist, i learned from a talk today (无内容) - blobfish (0 bytes) 2009-11-24, 09:48:02 (389642)
        
        by screw I didn't mean how they do each other. (无内容) - tinaliang (0 bytes) 2009-11-24, 09:34:46 (389636)

加跟贴