Dorsal-ventral patterning within the ectoderm of the Drosophila embryo requires seven zygotic genes including sog (short gastrulation). Sog is expressed in the ventrolateral region of the embryo that gives rise to the nerve cord.
n. 1  1. The science of life and of living organisms, including their structure, function, growth, origin, evolution, and distribution. It includes botany and zoology and all their subdivisions. 2  2. The life processes or characteristic phenomena of a group or category of living organisms: the biology of fungi.
Physiology is the scientific study of how people's and animals' bodies function, and of how plants function. ...a prize for Medicine and Physiology. American English: physiology