Heredity in ophthalmology / Jules François.

  • François, J. (Jules)
Date:
1961
Catalogue details

Licence: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)

Credit: Heredity in ophthalmology / Jules François. Source: Wellcome Collection.

    23/750 (page 19)
    FERTILIZATION, CELL DIVISION, AND ESSENTIAL CONCEPTS OF GENETICS 19 The phenotype, as an expression of inherited factors, must be opposed to a phenocopy, a congenital but not hereditary expression of characters. Certain external circumstances (syphilis, toxoplasmosis, measles and other infections, intoxications, avitaminoses, metabolic disorders, circulatory or traumatic dis¬ turbances, etc.) can, indeed, produce a manifestation or a defect (embryopathy) identical to that which is due to the action of some hereditary factor.