Search results
Results from the WOW.Com Content Network
Deletion on a chromosome. In genetics, a deletion (also called gene deletion, deficiency, or deletion mutation) (sign: Δ) is a mutation (a genetic aberration) in which a part of a chromosome or a sequence of DNA is left out during DNA replication.
In genetics and especially genetic engineering, deletion mapping is a technique used to find out the mutation sites within a gene. The principle of deletion mapping involves crossing a strain which has a point mutation in a gene, with multiple strains who each carry a deletion in a different region of the same gene.
Gene knockout by mutation is commonly carried out in bacteria. An early instance of the use of this technique in Escherichia coli was published in 1989 by Hamilton, et al. [2] In this experiment, two sequential recombinations were used to delete the gene.
Biocultural anthropology can be defined in numerous ways. It is the scientific exploration of the relationships between human biology and culture. [1] " Instead of looking for the underlying biological roots of human behavior, biocultural anthropology attempts to understand how culture affects our biological capacities and limitations."
This theory implies that purifying selection is more efficient in the haploid stage of the life cycle where fitness effects are more fully expressed than in the diploid stage of the life cycle. Evidence supporting the masking theory has been reported in the single-celled yeast Saccharomyces cerevisiae . [ 8 ]
Feminist scholars question whether the dichotomies between nature and culture, or man and woman, are essential. For example, Donna Haraway's works on cyborg theory, as well as companion species [8] gesture toward a notion of "naturecultures": a new way of understanding non-discrete assemblages relating humans to technology and animals.
Memetics is a theory of the evolution of culture based on Darwinian principles with the meme as the unit of culture. The term "meme" was coined by biologist Richard Dawkins in his 1976 book The Selfish Gene, [1] to illustrate the principle that he later called "Universal Darwinism".
Crozier suggests that Cultural Selection emerges from three bases: Social contagion theory, Evolutionary epistemology, and Memetics. [1] This theory is an extension of memetics. In memetics, memes, much like biology's genes, are informational units passed through generations of culture. However, unlike memetics, cultural selection theory moves ...