A fate map can be used to map out the tissues and organs that will eventually de

Question

A fate map can be used to map out the tissues and organs that will eventually develop from specific germ layers. What will ectoderm eventually become [A] the lining of the gut [B] the epidermal layer of skin [C] muscle [D] the heart [E] none of the above Why did Hans Spemann call the dorsal lip of the blastopore the embryonic organizer [A] It is the point where gastrulation begins. [B] It becomes part of the nervous system. [C] It becomes part of the notochord. [D] It leads to the establishment of the embryonic axes. [E] After gastrulation, the ectodermal cells contribute predominantly to the developing [A] brain, nervous system, and sweat glands. [B] skeletal system and muscles. [C] inner lining of the gut and respiratory tract. [D] liver and pancreas. [E] None of the above The delta-notch system leads to inhibition in a field of cells [A] transient [B] communal [C] lateral [D] the elimination of [E] none of the above

Explanation / Answer

52. A fate.................become?

B. Epidermal layer of skin

Epidermis is derived from ectoderm. Muscles and heart is derived from mesoderm and gut lining (apart from mouth, pharynx and rectum) is derived from endoderm.

53. Why...............organizer?

D. It leadsto establishment of embryonic axes.

The dorsal lip of blastopore is capable of self differentiation and induces embryogenesis in surrounding tissues.

54. After..................developing

A. Brain, nervous system and sweat glands

The muscles are derived from mesoderm. Endoderm gives rise to inner lining of gut, respiratory tract as well as liver and pancreas.

55. The delta................cells

c. lateral

In lateral inhibition, if one cell adopts a particular fate, it prevents other cells from adopting the same fate.

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