-3. The figure below shows cleavage stages in an embryo. From studying the photographs, what can you surmise about the amount of yolk in this embryo? What features of the cleavage pattern lead you to this assessment?
-3. The figure below shows cleavage stages in an embryo. From studying the photographs, what can you surmise about the amount of yolk in this embryo? What features of the cleavage pattern lead you to this assessment?
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:**Cleavage Stages in an Embryo**
The figure below shows cleavage stages in an embryo. From studying the photographs, what can you surmise about the amount of yolk in this embryo? What features of the cleavage pattern lead you to this assessment?
**Image Description:**
The series of three images displays the sequential stages of cleavage in an embryo:
1. **First Image:** The embryo is in the initial cleavage stage with a visible division forming two distinct cells.
2. **Second Image:** The embryo has further divided, showing a four-cell stage.
3. **Third Image:** The embryo continues dividing, illustrating an advanced stage with multiple cells forming a clustered structure.
**Assessment Consideration:**
Observe the symmetrical nature of the cleavage and the uniformity in cell size, which might indicate minimal yolk presence, allowing for equal division of cells. Analyze the patterns of cell division—uniformity and distinct cell delineation often suggest holoblastic cleavage, indicative of a moderate to low yolk concentration.
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