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Understanding Embryonic Development: Insights from Lorna 356's Lectures on Gastrulation and Cellular Fate

Explore key insights from Lorna 356's lectures 5, 6, and 7, designed to enhance understanding in a specific academic field. This educational content focuses on critical concepts and theories, aiding students in mastering relevant...

Questions: 27 | Attempts: 10 | Last updated: Nov 28, 2025

Sample Question 1
In the early gastrula, how many tissues have their fate determined?

Two - the ventral side

None of the tissues

Three - the lateral edges

One- the dorsal lip

Sample Question 2
What happens to newt embryos when the zygote is constricted in the plane of the first cleavage according to re Spemann?

At the 16 cell stage a nucleus from one side escapes to the nuclear free half, and then proceeds to begin cleavage divisions on this second side. Eventually, two normal embryos form.

Newt embryos fail to divide and remain as a single cell.

The newt embryos form abnormally large cells at the site of constriction.

The zygote stops development completely.

Sample Question 3
During re Spemann's constriction along the plane of first cleavage, what was the significance of the observation?

It showed that the early amphibian nuclei have different genetic material.

That the early amphibian nuclei are the same, and that each is capalbeof forming an entire embryo.

It demonstrated that only one nucleus is sufficient for embryonic development in amphibians.

It indicated a lack of nucleus interaction during the early stages of embryonic development.

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