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  2. Germ-free animal - Wikipedia

    en.wikipedia.org/wiki/Germ-free_animal

    This process uses a non-germ-free mother which is sacrificed and sterilized before the pups' birth. After the cesarean birth, the pups must then be transferred to a sterile incubator with a germ-free mother for feeding and growth. [9] [10] These methods are only required for the generation of a germ-free mouse line. Once a line is generated ...

  3. Germline - Wikipedia

    en.wikipedia.org/wiki/Germline

    Setting aside an isolated germ cell population early in embryogenesis might promote cooperation between the somatic cells of a complex multicellular organism. [16] Another recent theory suggests that early germline sequestration evolved to limit the accumulation of deleterious mutations in mitochondrial genes in complex organisms with high ...

  4. Germline development - Wikipedia

    en.wikipedia.org/wiki/Germline_development

    The germ plasm effectively turns off gene expression to render the genome of the cell inert. Cells expressing germ plasm become primordial germ cells (PGCs) which will then give rise to the gametes. The germ line development in mammals, on the other hand, occurs by induction and not by an endogenous germ plasm (see reference 6.).

  5. Wechsler Preschool and Primary Scale of Intelligence

    en.wikipedia.org/wiki/Wechsler_Preschool_and...

    The Wechsler Preschool and Primary Scale of Intelligence (WPPSI) is an intelligence test designed for children ages 2 years 6 months to 7 years 7 months developed by David Wechsler in 1967. It is a descendant of the earlier Wechsler Adult Intelligence Scale and the Wechsler Intelligence Scale for Children tests.

  6. Preschool - Wikipedia

    en.wikipedia.org/wiki/Preschool

    Some studies dispute the benefits of preschool education, [25] [26] finding that preschool can be detrimental to cognitive and social development. [ 27 ] [ 28 ] A study by UC Berkeley and Stanford University on 14,000 preschools revealed that while there is a temporary cognitive boost in pre-reading and math, preschool holds detrimental effects ...

  7. Microorganism - Wikipedia

    en.wikipedia.org/wiki/Microorganism

    A microorganism, or microbe, [a] is an organism of microscopic size, which may exist in its single-celled form or as a colony of cells.. The possible existence of unseen microbial life was suspected from ancient times, such as in Jain scriptures from sixth century BC India.

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