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However, natural selection cannot act when alleles have never occurred together, as they would in the genome of a hybrid. [10] Therefore, it is possible that when these alleles interact, these alleles prove to be incompatible. An incompatible gene prevents the populations from successfully hybridising.
The National Book Foundation (NBF) is an American nonprofit organization established with the goal "to raise the cultural appreciation of great writing in America." [1] Established in 1989 by National Book Awards, Inc., [2] the foundation is the administrator and sponsor of the National Book Awards, a set of literary awards inaugurated in 1936 and continuous from 1950.
Light micrograph of a moss's leaf cells at 400X magnification. The following outline is provided as an overview of and topical guide to cell biology: . Cell biology – A branch of biology that includes study of cells regarding their physiological properties, structure, and function; the organelles they contain; interactions with their environment; and their life cycle, division, and death.
This page was last edited on 24 February 2022, at 23:06 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
Histologic specimen being placed on the stage of an optical microscope. Human lung tissue stained with hematoxylin and eosin as seen under a microscope.. Histology, [help 1] also known as microscopic anatomy or microanatomy, [1] is the branch of biology that studies the microscopic anatomy of biological tissues.
There are two structural classes of NF-κB proteins: class I (top) and class II (bottom). Both classes of proteins contain a N-terminal DNA-binding domain (DBD), which also serves as a dimerization interface to other NF-κB transcription factors and, in addition, binds to the inhibitory IκBα protein.
Sexual differentiation is the process of development of the sex differences between males and females from an undifferentiated zygote. [1] [2] Sex determination is often distinct from sex differentiation; sex determination is the designation for the development stage towards either male or female, while sex differentiation is the pathway towards the development of the phenotype.
This bibliography of biology is a list of notable works, organized by subdiscipline, on the subject of biology. [ 1 ] [ 2 ] Biology is a natural science concerned with the study of life and living organisms , including their structure, function, growth, origin, evolution, distribution, and taxonomy. [ 3 ]