Embryology Theories Quiz

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Questions and Answers

What does epigenesis assume about embryonic development and differentiation?

They are predetermined by genetic factors
They originate in a homogeneous mass of living matter (correct)
They are influenced by external environmental factors only
They are purely random processes

What is the study of embryology concerned with?

The development of animals from the fertilized egg to the formation of all major organ systems (correct)
The study of animal genetics
The study of adult animals
The behavior of animals in their natural habitat

According to preformation theories, what did sex-cells contain?

Transparent, highly folded, small and unobservable miniatures of the adult
Miniature organisms presented in the head of the sperm and not in egg
Preformed embryos or miniatures of the adult (correct)
Highly folded transparent containers

What did the cell theory discover about the ovum and fertilization?

<p>Ovum was a single cell and fertilization consisted of the union of ovum and spermatozoon in the formation of the zygote (A)</p> Signup and view all the answers

According to the recapitulation theory, what reappears in the developmental stages of an individual?

<p>Ancestral characters (A)</p> Signup and view all the answers

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Study Notes

Embryonic Development and Differentiation

Epigenesis assumes that embryonic development and differentiation occur through a series of complex interactions between cells, with the embryo's form emerging from these interactions.

Study of Embryology

Embryology is concerned with the study of the formation and development of living organisms from fertilization to birth.

Preformation Theories

Preformation theories propose that sex-cells contain a tiny, fully formed individual, or homunculus, which grows when fertilized.

Cell Theory

The cell theory discovered that the ovum is a single cell, and that fertilization occurs when a sperm penetrates the ovum.

Recapitulation Theory

The recapitulation theory proposes that the developmental stages of an individual reappear in the same sequence as those found in the evolutionary history of the species.