New answers tagged gene-expression
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Regeneration of complex tissues like limbs is known in many animals. Salamander has been used as a model for limb regeneration. During regeneration, the cells at the amputation site de-differentiate to form what is known as a blastema which in turn differentiates to form different kinds of cells.
Christen et al. (2010) have found that de-differentiation in ...
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What is a pluripotent stem cell?
A pluripotent stem cell is a cell that can differentiate into any of the major tissue categories. Every animal exists as a collection of pluripotent stem cells at an early stage of development: if you are looking for an evolutionary purpose, that's where you should start, and the purpose is pretty obvious: you start as a ...
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"Or are all alleles actually codominant at the transcription/protein level?"
Yes this is the right idea. Generally all alleles are transcribed independently (with some exceptions like in females where one X chromosome is inactivated). And the dominant and recessive phenotypes are in a sense extreme cases of codominance. The terms are used for describing ...
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An example of incomplete dominance often given is of red and white
flowered snapdragons giving pink flowered offspring because enzymes
for both pigments are transcribed and translated and the mixing of
these pigments gives the intermediate phenotype.
White snapdragons are not making a white pigment. A step in the pigment-making pathway fails, because ...
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