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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 transfer event (xenologs). [1] Homology among DNA, RNA, or proteins is typically inferred from their nucleotide or amino acid sequence similarity. Significant ...
Two segments of DNA can have shared ancestry because of either a speciation event or a duplication event . Homology among proteins or DNA is typically inferred from their sequence similarity. Significant similarity is strong evidence that two sequences are related by divergent evolution of a common ancestor.
The search for the homologous target, helped by numerous proteins collectively referred as the synaptonemal complex, cause the two homologs to pair, between the leptotene and the pachytene phases of meiosis I. [4] Resolution of the DNA recombination intermediate into a crossover exchanges DNA segments between the two homologous chromosomes at a ...
Hence, the ratio (quotient) of two line segments remains unchanged. In case of the calculation is analogous but a little extensive. Consequences: A triangle is mapped on a similar one. The homothetic image of a circle is a circle. The image of an ellipse is a similar one. i.e. the ratio of the two axes is unchanged.
Homologation, from the ancient Greek "to agree", to indicate the approval of a sanctioning body; Homologation (motorsport), the process in motorsports where the sanctioning body approves a racing model for official use; Homological word, a word expressing a property which it possesses itself
In organic chemistry, a homologation reaction, also known as homologization, is any chemical reaction that converts the reactant into the next member of the homologous series. A homologous series is a group of compounds that differ by a constant unit, generally a methylene ( −CH 2 − ) group.
Homologation (Greek homologeo, ὁμολογέω, "to agree") is the granting of approval by an official authority.This may be a court of law, a government department, or an academic or professional body, any of which would normally work from a set of rules or standards to determine whether such approval should be given.
A trajectory of a system variable is a sequence of segments concatenated. We call a trajectory constant (respectively linear) if its concatenating segments are constant (respectively linear). An event segment is a special class of the constant segment with a constraint in which the constant segment is either one of a timed event or a null-segment.