The theory of facilitated variation demonstrates how seemingly complex biological systems can arise through a limited number of regulatory genetic changes...

course by forces internal to the organism. Orthogenesis assumes that variation is not random but is directed towards fixed goals. Selection is thus powerless...

genes. This supports Marc Kirschner and John C. Gerhart's theory of Facilitated Variation, which states that morphological evolutionary novelty is generated...

arbitrary biases in the generation of variation. The theory of arrival biases does not require or imply facilitated variation or directed mutation and is not...

Heliconius melpomene, which are Müllerian mimics. In so-called facilitated variation, their wing patterns arose in different evolutionary events, but...

can emerge with little or no initial genetic modification (see facilitated variation), and provide the new raw material on which natural selection can...

most recent book, Kirschner and Gerhart proposed a new theory of "facilitated variation" that aims to answer the question: How can small, random genetic...

organism Revolutionary change in phenotype can occur through mutation, facilitated variation or threshold events Repeated evolution in isolated populations can...

Furthermore, random fertilization also contributes to variation. Variation and recombination can be facilitated by transposable genetic elements, endogenous retroviruses...

can be explained in terms of simpler precursors. The theory of facilitated variation challenges irreducible complexity. Marc W. Kirschner, a professor...

Forebrain dehydration sensing facilitated by the anterior communicating artery: How hemodynamic properties facilitate more good dehydration sensing in...

Diurnal mood variation or morning depression is a prominent depression symptom characterized by gradual mood improvement through the day, reaching its...

orients and permutes the corners when the edges are oriented, or Winter Variation (also known as Valk Last Slot, or VLS), which finishes OLL while inserting...

replaced by an A in a minority of individuals. The two possible nucleotide variations of this SNP – G or A – are called alleles. SNPs can help explain differences...

Variation of traits, both genotypic and phenotypic, exists within all populations of organisms. However, some traits are more likely to facilitate survival...

Genetics is the study of genes, genetic variation, and heredity in organisms. It is an important branch in biology because heredity is vital to organisms'...

churches simply use the cafe model as a way to build community, facilitating variation within their normal service structure and within the confines of...

further sub-variants, for example Horde chess is a variation upon Dunsany's Chess. Some variations are created for the purpose of composing interesting...

nearly periodic 11-year change in the Sun's activity measured in terms of variations in the number of observed sunspots on the Sun's surface. Over the period...

Evolutionary capacitance is the storage and release of variation, just as electric capacitors store and release charge. Living systems are robust to mutations...

A facilitation cascade is a sequence of ecological interactions that occur when a species benefits a second species that in turn has a positive effect...

disability purely to inherent deficits. It instead situates human cognitive variation in the context of biodiversity and the politics of minority groups. Some...

created by co sputtering from separate targets of Ni and Mg to facilitate variations in composition. Single-target d.c. magnetron sputtering could be...

if the main axis of variation is aligned with the direction of selection, covariation (genetic or phenotypic) will facilitate the rate of adaptive evolution;...

green June beetle (Cotinis nitida) (Coleoptera: Scarabaeidae): local variation in the beetle's major avian predators and in the competition for mates"...

genetic variation in our species, but shows that such variation is not consistent with biological definitions of race. Nor does that variation map precisely...

Adler variation 4.Nf3 sees White seeking a spatial advantage in the centre with his pieces, notably the important d5-square. The Alekhine variation 4.e4...

a xiphoidal foramen). These morphological variations are hereditary,[citation needed] which can facilitate the categorization of family members when addressing...

alleles since crossing over of DNA takes place during meiosis, creating variation. Parthenogenetic offspring in species that use either the XY or the X0...

Variations of golf include methods of scoring, starting procedures, playing formats, golf games, and activities based on or similar to the sport of golf...