English modal verbs - Syntax. 1  A modal verb serves as an auxiliary to another verb, which appears in infinitive form (the bare infinitive, or the to-infinitive in the cases of ought and used as discussed above).
The Extended Phenotype The Extended Phenotype is a 1982 book by Richard Dawkins in which he introduced a biological concept of the same name. The main idea is that phenotype should not be limited to biological processes such as protein biosynthesis or tissue growth, but extended to include all effects that a gene has on its environment, inside or outside the body of the individual organism.
Definition. It describes the phenomenon of differing clinical features or phenotype among individuals carrying the same gene allele or genotype. Expressivity differs from penetrance, which describes the probability that a genetic variation (or allele) will yield the phenotype at all.Variable expression of a phenotype may be influenced by other genetic variations, epigenetic factors, or environment.This term is often used in conjunction with explanations of variable severity of autism-related traits within families.efinition. It describes the phenomenon of differing clinical features or phenotype among individuals carrying the same gene allele or genotype. Expressivity differs from penetrance, which describes the probability that a genetic variation (or allele) will yield the phenotype at all.