Which of the following steps of sea urchin fertilization initiates the formation of the fertilization envelope? A Acrosomal reaction Fast block to polyspermy Egg activation D Cortical reaction Chemo-attraction
Which of the following steps of sea urchin fertilization initiates the formation of the fertilization envelope? A Acrosomal reaction Fast block to polyspermy Egg activation D Cortical reaction Chemo-attraction
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:**Question:**
Which of the following is involved in the block to polyspermy in the sea urchin? (Check all that apply.)
- (A) Fertilization potential
- (B) Fertilization envelope
- (C) Release of Juno
- (D) Zona reaction
- (E) Zinc Zinc shield
(Note: There are no graphs or diagrams included in the image.)
Transcribed Image Text:**Question:**
Which of the following steps of sea urchin fertilization initiates the formation of the fertilization envelope?
**Options:**
A. Acrosomal reaction
B. Fast block to polyspermy
C. Egg activation
D. Cortical reaction
E. Chemo-attraction
**Explanation:**
In the context of sea urchin fertilization, the formation of the fertilization envelope is a critical event that prevents polyspermy, ensuring that only one sperm fertilizes the egg. The **cortical reaction** (Option D) is the step that initiates this process. During the cortical reaction, cortical granules within the egg fuse with the plasma membrane, releasing their contents and leading to changes in the egg’s extracellular matrix. This forms the fertilization envelope, which acts as a barrier to other sperms.
Expert Solution
Definition Fertilization
Fertilization is the union of male ( spermatozoa ) and female ( ovum ) gametes which results in the formation of zygote. In this process haploid set of chromosome from one gamete fuses with the haploid set of chromosome of another gamete to attain deploid parental chromosome number.
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