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The split gene theory is a theory of the origin of introns, long non-coding sequences in eukaryotic genes between the exons. [1] [2] [3] The theory holds that the randomness of primordial DNA sequences would only permit small (< 600bp) open reading frames (ORFs), and that important intron structures and regulatory sequences are derived from stop codons.
The evolution of biological complexity is one important outcome of the process of evolution. [1] Evolution has produced some remarkably complex organisms – although the actual level of complexity is very hard to define or measure accurately in biology, with properties such as gene content, the number of cell types or morphology all proposed as possible metrics.
This glossary of biology terms is a list of definitions of fundamental terms and concepts used in biology, the study of life and of living organisms.It is intended as introductory material for novices; for more specific and technical definitions from sub-disciplines and related fields, see Glossary of cell biology, Glossary of genetics, Glossary of evolutionary biology, Glossary of ecology ...
Published online in the Image & Video Library of The American Society for Cell Biology; The Image & Video Library Archived 2011-06-10 at the Wayback Machine of The American Society for Cell Biology contains many videos showing the cell division. The Cell Division of the Cell Image Library; Images : Calanthe discolor Lindl. – Flavon's Secret ...
Also called functionalism. The Darwinian view that many or most physiological and behavioral traits of organisms are adaptations that have evolved for specific functions or for specific reasons (as opposed to being byproducts of the evolution of other traits, consequences of biological constraints, or the result of random variation). adaptive radiation The simultaneous or near-simultaneous ...
Cheongsam (UK: / tʃ (i) ɒ ŋ ˈ s æ m /, US: / tʃ ɔː ŋ ˈ s ɑː m /) or zansae, also known as the qipao (/ ˈ tʃ iː p aʊ /) and sometimes referred to as the mandarin gown, is a Chinese dress worn by women which takes inspiration from the qizhuang, the ethnic clothing of the Manchu people.
The gown featured floral accents across the front and a thigh-high split. She also carried a Jeffrey Levinson clutch. By the end of the night, Teigen’s dress had split open in the back along the ...
In this diagram of a duplicated chromosome, (2) identifies the centromere—the region that joins the two sister chromatids, or each half of the chromosome.In prophase of mitosis, specialized regions on centromeres called kinetochores attach chromosomes to spindle fibers.