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NCBI GenBank and Entrez Nucleotide
Overview: GenBank is an NCBI database that serves as an archive for all publicly available DNA sequences from more than 100,000 different organisms.
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NCBI-BLAST website
NCBI-BLAST Tutorial
WU-BLAST - The original gapping BLAST with statistics, developed and maintained by Warren Gish at Washington University in St. Louis ...
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NCBI Open-Access Books
EverythingBio : An online source for everything biology related.
Kimball's Biology Pages: An online searchable textbook.
Biology Online: One person-maintained site with tutorials.
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The NCBI can also identify unknown genes by comparing them with known genes in the database. One program commonly used for this purpose is BLAST (Basic Local Alignment Search Tool).
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See also the figure at NCBI.
Chiasma
The term which Janssens (1909) introduced for the nodes (Gk. chiasma; cross) where the individual chromosomes making up each pair remain in contact during the diplotene and diakinetic stages of prophase 1 and ...
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