Early History

Question 1

said that both male and female sex products are necessary for the initiation of development. Embryological development occurs through progressive growth and development. Coined the theroy of epigenesis.

Answer 1

Lazzaro Spallanzani and Caspar Friedrichwolff

Question 2

observed the human sperm and coined the theory of preformation and discovered “animalcules” in semen.

Answer 2

Hamm and Leuvenhoek

Question 3

Described the ovarian follicle as Graafian follicle. Contributed to the idea of “omne vivum ex ovo” which means all life comes from an egg, promoting the existence of the ova.

Answer 3

William Harvey and Graaf

Question 4

affinity between embryos of higher and lower vertebrates (pharyngeal pouches)

Answer 4

Heinrich Rathke

Question 5

Made significant strides in descriptive embryology searching for the vital force. He is also the father of emrbyology

Answer 5

Karl Ernst Von Baer

Question 6

Did the germplasm theory and the integration of genetics into embryonic development. Self-reproducing determinants as the guiding force for morphogenesis. The offspring does not inherit its characteristics from the body of the parent but only from the germ cells

Answer 6

August Weismann

Question 7

Laid the foundation of the modern embryology and histology with the microscope

Answer 7

Schleiden and Schwann

Question 8

Founder of experimental biology and believed that mitotic cell division of the fertilized egg is the mechanism by which future parts of a developing organism are determined.

Answer 8

Wilhelm roux

Question 9

First person to demonstrate morphogenesis

Answer 9

Caspar FriedrichWolff

Question 10

Law of Biogenesis and was the leading authority in embryology during the late 1800s. Said that ontogeny recapitulates phylogeny

Answer 10

Ernst Haeckel

Question 11

He was first to conduct the systematic study of embryos. Recorded different stages in the development of the chick embryo and recognized that there are multiple ways for organisms to reproduce.

Answer 11

Aristotle

Question 12

he successfully performed the first artificial insemination (using frog eggs)

Answer 12

Lazzaro Spallanzani

Question 13

the first person to note the many similarities between the embryos of vertebrates, particularly the amniotes.

Answer 13

Karl Ernst Von Baer

Question 14

Won the novel price for medicine. Concept of embryonic induction involving the dorsal lip of blastopore

Answer 14

Speman and Mangold

Question 15

he made use frog eggs to elucidate mitotic cell division stems

Answer 15

wilhelm roux

Question 16

Identified the existence of the germ layers

Answer 16

Christian Pander

Question 17

Was the first man to observe sexual reproduction.

Answer 17

Oscar Hertwig

Question 18

Demonstration of fertilization of sea urchin. Existence of polar bodies. Advances in the understanding of meiosis

Answer 18

Oscar and Richard Hertwig