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Serial homology is a special type of homology, defined by Owen as "representative or repetitive relation in the segments of the same organism." [ 1 ] Ernst Haeckel preferred the term "homotypy" for the same phenomenon.
In biology, homology is similarity in anatomical structures or genes between organisms of different taxa due to shared ancestry, regardless of current functional differences. Evolutionary biology explains homologous structures as retained heredity from a common ancestor after having been subjected to adaptive modifications for different ...
Earthworms are a classic example of biological homonymous metamery – the property of repeating body segments with distinct regions. In biology, metamerism is the phenomenon of having a linear series of body segments fundamentally similar in structure, though not all such structures are entirely alike in any single life form because some of them perform special functions. [1]
Sequence homology is the biological homology between DNA, RNA, or protein sequences, defined in terms of shared ancestry in the evolutionary history of life. Two segments of DNA can have shared ancestry because of three phenomena: either a speciation event (orthologs), or a duplication event (paralogs), or else a horizontal (or lateral) gene ...
Human DMC1 is a homomultimer in the form of an octameric ring with a diameter of 140 Å and a hole in the middle of 45 Å. [ 12 ] [ 9 ] DMC1 binds preferentially to ssDNA over dsDNA. [ 12 ] Unlike RecA and Rad51, DMC1 does not appear to form a helical filament on DNA, instead forming rings with DNA passing through the center.
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So, humans have two sets of 23 chromosomes in each cell that contains a nucleus. One set of 23 chromosomes (n) is from the mother (22 autosomes, 1 sex chromosome (X only)) and one set of 23 chromosomes (n) is from the father (22 autosomes, 1 sex chromosome (X or Y)). Ultimately, this means that humans are diploid (2n) organisms. [2]
Hedgehog acyltransferase (HHAT), also called skinny hedgehog homology in humans, is a human gene. [ 1 ] [ 2 ] The HHAT gene encodes an enzyme that catalyzes N-terminal palmitoylation of sonic hedgehog .