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