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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.
In the field of developmental biology, regional differentiation is the process by which different areas are identified in the development of the early embryo. [1] The process by which the cells become specified differs between organisms .
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 ...
The cell cycle in eukaryotes: I = Interphase, M = Mitosis, G 0 = Gap 0, G 1 = Gap 1, G 2 = Gap 2, S = Synthesis, G 3 = Gap 3. Cell division is the process by which a parent cell divides into two daughter cells. [1] Cell division usually occurs as part of a larger cell cycle in which the cell grows and replicates its chromosome(s) before dividing.
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.
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 ...
Fragmentation in multicellular or colonial organisms is a form of asexual reproduction or cloning, where an organism is split into fragments upon maturation and the split part becomes the new individual. The organism may develop specific organs or zones to shed or be easily broken off.
The frog is the end-product of thousands years of traditional Chinese knotting craft, which is itself rooted in the Lào zi culture. [3] [11] As a form of fastener, the frog first appeared on traditional Chinese clothing, [1] [12] and can be traced back to the Song dynasty when fabric was braided into braid buckles to create the loop and the button knot.