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Evolution and Development
Evolution and Development

... • Size at which horns develop has diverged in two introduced populations Developmental constraints on evolution • Absence of variation • For example, the lack of cells, proteins, or genes required for the development of a structure • Strong correlations among characters • May result from interaction ...
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PCB 6528 Exam – Organelle genomes and gene expression

... http://www.arabidopsis.org/servlets/TairObject?name=AT2G21640&type=locus). The transcript is up-regulated in response to a wide suite of hydrogen peroxide, superoxide and singlet oxygen generating agents (Gadjev et al. , Plant Physiol. 141: 436). The protein product, however, was up-regulated in Ara ...
tutorialdm
tutorialdm

... Each codon has 3 nucleotides, denote by fi (I = 1,2,3) Where s and n for a codon are given by s = ∑3i=1fi and n = (3-s) ...
< 1 ... 485 486 487 488 489 490 491 492 493 ... 873 >

Helitron (biology)

A helitron is a transposon found in eukaryotes that is thought to replicate by a so-called ""rolling-circle"" mechanism. This category of transposons was discovered by Vladimir Kapitonov and Jerzy Jurka in 2001. The rolling-circle process begins with a break being made at the terminus of a single strand of the helitron DNA. Transposase then sits at this break and at another break where the helitron targets as a migration site. The strand is then displaced from its original location at the site of the break and attached to the target break, forming a circlular heteroduplex. This heteroduplex is then resolved into a flat piece of DNA via replication. During the rolling-circle process, DNA can be replicated beyond the initial helitron sequence, resulting in the flanking regions of DNA being ""captured"" by the helitron as it moves to a new location.
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