Platyhelminthes, or flatworms, lack a true body cavity, making them aceolomates. Their bodies are filled with mesodermal cells, leaving no space for organs to be suspended in a coelom. This characteristic is a key feature distinguishing them from coelomates and pseudocoelomates.
List I | List II |
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(A) Radiation hybrid mapping | (I) DNA can be cut into large fragments and circularized for use in chromosome walking |
(B) Sequence tagged site (STS) mapping | (II) Useful for cloning of overlapping DNA fragments (restricted to about 200 kb) |
(C) Chromosome jumping | (III) Fragment genome into large pieces and locate markers and genes |
(D) Chromosome walking | (IV) Applicable to any part of DNA sequence if some sequence information is available |