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In case of morphallactic regeneration:
- a)there is repatterning of the existing tissues with little new growth.
- b)there is repatterning of the existing tissues after the stem cell division has taken place.
- c)there is cell division of the differentiated cells which maintain their differentiated state to finally form a complete organism.
- d)there is dedifferentiation of the cells at the cut surface which become undifferentiated. These undifferentiated cells then divide to redifferentiate to form the complete structure.
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
In case of morphallactic regeneration:a)there is repatterning of the e...
Concept:
- Regeneration—the reactivation of development in later life to restore missing tissues—is so “unhuman” that it has been a source of fascination to humans since the beginnings of biological science.
- It is difficult to behold the phenomenon of limb regeneration in newts or starfish without wondering why we cannot grow back our own arms and legs.
There are three major ways by which regeneration can occur:
- The first mechanism involves the dedifferentiation of adult structures to form an undifferentiated mass of cells that then becomes respecified.
- This type of regeneration is called epimorphosis and is characteristic of regenerating limbs.
- The second mechanism is called morphallaxis.
- Here, regeneration occurs through the repatterning of existing tissues, and there is little new growth. Such regeneration is seen in hydras.
- A third type of regeneration is an intermediate type, and can be thought of as compensatory regeneration.
- Here, the cells divide, but maintain their differentiated functions.
- They produce cells similar to themselves and do not form a mass of undifferentiated tissue.
- This type of regeneration is characteristic of the mammalian liver.
Explanation:
- When a hydra is cut in half, the half containing the head will regenerate a new basal disc, and the half containing the basal disc will regenerate a new head.
- Moreover, if a hydra is cut into several portions, the middle portions will regenerate both heads and basal discs at their appropriate ends.
- No cell division is required for this to happen, and the result is a small hydra.
- This regeneration is morphallactic.
- The polarity of the hydra is coordinated by a series of morphogenetic gradients that permit the head to form only at one place and the disc to form only at another.
- Evidence for such gradients in hydras was first obtained by grafting experiments begun by Ethel Browne in the early 1900s.
- When hypostome tissue from one hydra is transplanted into the middle of another hydra, it forms a new apical-basal axis, with the hypostome extending outward.
- When a basal disc is grafted to the middle of a host hydra, a new axis also forms, but with the opposite polarity, extending a basal disc.
- When cells from both ends are transplanted simultaneously into the middle of a host, no new axis is formed, or the new axis has little polarity.
- These experiments have been interpreted to indicate the existence of a head activator gradient (highest at the hypostome) and a basal activator gradient (highest at the basal disc).
As Morphallatic
regeneration occurs through the repatterning of existing tissues, and there is little new growth option 1 is the correct option.
Most Upvoted Answer
In case of morphallactic regeneration:a)there is repatterning of the e...
Explanation:
Morphallactic regeneration refers to the process where existing tissues are reorganized and repatterned to regenerate a lost structure. Here's why option 'A' is the correct answer:
- Repatterning of existing tissues: In morphallactic regeneration, there is no significant new growth of cells. Instead, the existing tissues are rearranged and repatterned to restore the lost structure.
- Limited cell division: Unlike epimorphic regeneration where there is extensive cell division and growth of new tissues, morphallactic regeneration involves minimal cell division. The focus is on reorganizing the existing cells to regenerate the structure.
- Stem cell division: While stem cells may play a role in some forms of regeneration, in morphallactic regeneration, the emphasis is on utilizing the differentiated cells to reform the lost structure without extensive proliferation of stem cells.
- Complete organism formation: The process of morphallactic regeneration does not involve dedifferentiation of cells at the cut surface. Instead, the differentiated cells retain their specialized functions and contribute to the reorganization of tissues to eventually form the complete organism.
In conclusion, morphallactic regeneration involves the repatterning of existing tissues with minimal new growth, making option 'A' the most suitable explanation for this type of regeneration.
Morphallactic regeneration refers to the process where existing tissues are reorganized and repatterned to regenerate a lost structure. Here's why option 'A' is the correct answer:
- Repatterning of existing tissues: In morphallactic regeneration, there is no significant new growth of cells. Instead, the existing tissues are rearranged and repatterned to restore the lost structure.
- Limited cell division: Unlike epimorphic regeneration where there is extensive cell division and growth of new tissues, morphallactic regeneration involves minimal cell division. The focus is on reorganizing the existing cells to regenerate the structure.
- Stem cell division: While stem cells may play a role in some forms of regeneration, in morphallactic regeneration, the emphasis is on utilizing the differentiated cells to reform the lost structure without extensive proliferation of stem cells.
- Complete organism formation: The process of morphallactic regeneration does not involve dedifferentiation of cells at the cut surface. Instead, the differentiated cells retain their specialized functions and contribute to the reorganization of tissues to eventually form the complete organism.
In conclusion, morphallactic regeneration involves the repatterning of existing tissues with minimal new growth, making option 'A' the most suitable explanation for this type of regeneration.
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In case of morphallactic regeneration:a)there is repatterning of the existing tissues with little new growth.b)there is repatterning of the existing tissues after the stem cell division has taken place.c)there is cell division of the differentiated cells which maintain their differentiated state to finally form a complete organism.d)there is dedifferentiation of the cells at the cut surface which become undifferentiated. These undifferentiated cells then divide to redifferentiate to form the complete structure.Correct answer is option 'A'. Can you explain this answer?
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In case of morphallactic regeneration:a)there is repatterning of the existing tissues with little new growth.b)there is repatterning of the existing tissues after the stem cell division has taken place.c)there is cell division of the differentiated cells which maintain their differentiated state to finally form a complete organism.d)there is dedifferentiation of the cells at the cut surface which become undifferentiated. These undifferentiated cells then divide to redifferentiate to form the complete structure.Correct answer is option 'A'. Can you explain this answer? for Software Development 2025 is part of Software Development preparation. The Question and answers have been prepared according to the Software Development exam syllabus. Information about In case of morphallactic regeneration:a)there is repatterning of the existing tissues with little new growth.b)there is repatterning of the existing tissues after the stem cell division has taken place.c)there is cell division of the differentiated cells which maintain their differentiated state to finally form a complete organism.d)there is dedifferentiation of the cells at the cut surface which become undifferentiated. These undifferentiated cells then divide to redifferentiate to form the complete structure.Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Software Development 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In case of morphallactic regeneration:a)there is repatterning of the existing tissues with little new growth.b)there is repatterning of the existing tissues after the stem cell division has taken place.c)there is cell division of the differentiated cells which maintain their differentiated state to finally form a complete organism.d)there is dedifferentiation of the cells at the cut surface which become undifferentiated. These undifferentiated cells then divide to redifferentiate to form the complete structure.Correct answer is option 'A'. Can you explain this answer?.
In case of morphallactic regeneration:a)there is repatterning of the existing tissues with little new growth.b)there is repatterning of the existing tissues after the stem cell division has taken place.c)there is cell division of the differentiated cells which maintain their differentiated state to finally form a complete organism.d)there is dedifferentiation of the cells at the cut surface which become undifferentiated. These undifferentiated cells then divide to redifferentiate to form the complete structure.Correct answer is option 'A'. Can you explain this answer? for Software Development 2025 is part of Software Development preparation. The Question and answers have been prepared according to the Software Development exam syllabus. Information about In case of morphallactic regeneration:a)there is repatterning of the existing tissues with little new growth.b)there is repatterning of the existing tissues after the stem cell division has taken place.c)there is cell division of the differentiated cells which maintain their differentiated state to finally form a complete organism.d)there is dedifferentiation of the cells at the cut surface which become undifferentiated. These undifferentiated cells then divide to redifferentiate to form the complete structure.Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Software Development 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In case of morphallactic regeneration:a)there is repatterning of the existing tissues with little new growth.b)there is repatterning of the existing tissues after the stem cell division has taken place.c)there is cell division of the differentiated cells which maintain their differentiated state to finally form a complete organism.d)there is dedifferentiation of the cells at the cut surface which become undifferentiated. These undifferentiated cells then divide to redifferentiate to form the complete structure.Correct answer is option 'A'. Can you explain this answer?.
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