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In biology, determination is the process of matching a specimen or sample of an organism to a known taxon, for example identifying a plant as belonging to a particular species. Expert taxonomists may perform this task, but structures created by taxonomists are sometimes used by non-specialists.
Biological determinism, also known as genetic determinism, [1] is the belief that human behaviour is directly controlled by an individual's genes or some component of their physiology, generally at the expense of the role of the environment, whether in embryonic development or in learning. [2]
The sample size is an important feature of any empirical study in which the goal is to make inferences about a population from a sample. In practice, the sample size used in a study is usually determined based on the cost, time, or convenience of collecting the data, and the need for it to offer sufficient statistical power .
Thus, the fate of the cell depends on factors secreted into its cytoplasm during cleavage. Autonomous specification was demonstrated in 1887 by a French medical student, Laurent Chabry, working on tunicate embryos. [20] [21] This asymmetric cell division usually occurs early in embryogenesis. Positive feedback can create asymmetry from homogeneity.
The pygmy mammoth is an example of insular dwarfism, a case of Foster's rule, its unusually small body size an adaptation to the limited resources of its island home.. A biological rule or biological law is a generalized law, principle, or rule of thumb formulated to describe patterns observed in living organisms.
Image credits: saverity40 Pollen, dust, animal, and certain food allergies (e.g., to nuts, shellfish, and dairy) are fairly common. But their severity has a huge range.
For example, while having an XY format, Xiphophorus nezahualcoyotl and X. milleri also have a second Y chromosome, known as Y', that creates XY' females and YY' males. [16] At least one monotreme, the platypus, presents a particular sex determination scheme that in some ways resembles that of the ZW sex chromosomes of birds and lacks the SRY gene.
This test question appeared on a Luther Burbank High School biology final in June 2024. Student names were obscured by the sources who provided the images to the Sacramento Bee.