EARLY IDEAS GENETICS OF INHERITANCE - PowerPoint PPT Presentation

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EARLY IDEAS GENETICS OF INHERITANCE

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EARLY IDEAS GENETICS OF INHERITANCE Hippocrates (460 377 B.P.) every part of the body was involved in the production of seeds The seeds would fuse together ... – PowerPoint PPT presentation

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Title: EARLY IDEAS GENETICS OF INHERITANCE


1
EARLY IDEAS GENETICS OF INHERITANCE
2
Hippocrates (460 377 B.P.)
  • every part of the body was involved in the
    production of seeds
  • The seeds would fuse together to make a new person

3
ARISTOTLE (384- 322 B.C.E)
  • Theory of Pangenesis
  • Egg and sperm consist of particles ? pangenes
    from all parts of body
  • upon fertilization the pangenes developed into
    the parts of the body from which they were
    formed.

4
WILLIAM HARVEY(1578 1657)
  • New individual arose through the process of
    EPIGENESIS
  • ? embryo grew in stages and was affected by
    factors both inside and outside of the mother

5
ANTON VAN LEEUWENHOEK (1632
1723)
  • Used a microscope to examine gametes
  • found animalcules in semen and decided they
    were preformed embryos
  • Female contribution was only the influence of the
    uterus during embryo development

6
BLENDING THEORY
  • Characteristics of parents blended in the
    offspring
  • Blending was irreversible, thus original
    characteristics would not appear in future
    generations

7
FRANCIS GALTON (1870s)
  • Disproved the theory of pangenesis (still
    influenced biology 100 years ago)
  • Genes formed in every organ of both male and
    female body and moved to genitals

8
CHARLES DARWIN(1809 1882)
  • Offspring have variations of their parents
    characteristics
  • Couldnt explain why suggested current science
    had not yet discovered the puzzle pieces yet

9
GREGOR MENDEL (1822 1884)
  • Developed the fundamental principles of modern
    genetics
  • Experimented on pea plants and proposed
  • Mendels law of heredity
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