Correct option is A
The correct answer is: (1) The first stage of commitment is termed as specification, while the second stage is determination.
Explanation:
In the process of differentiation and commitment during early embryonic development, two stages are involved. The first stage, called specification, is where a cell is reversibly determined to develop into a particular type of cell or tissue under normal conditions. The second stage is determination, where the cell’s fate becomes irreversible. In this stage, the cell is committed to its fate, and no matter the surrounding environment, it will continue its development towards that specific fate.
Information Booster:
Specification is the process in which a cell becomes set to develop into a certain type of cell or tissue, but it can still be influenced by its surroundings.
Determination makes this commitment irreversible, and the cell will develop along its predetermined pathway even if it is moved to another location.
Differentiation follows determination, where the cell takes on its final specialized form.
These stages are essential for proper development and pattern formation in multicellular organisms.
Additional Knowledge:
If a specified cell is transplanted to a region of differently specified cells, the fate of the specified cell remains unchanged (option 2) is incorrect. In the specification stage, a cell’s fate can still be influenced by the surrounding cells.
A cell or tissue is said to be determined when it shows reversible fate under the influence of the surrounding cells or tissue (option 3) is incorrect. Determination refers to an irreversible commitment, not a reversible one.
The first stage of specification is termed as commitment when a cell develops autonomously (option 4) is incorrect. Commitment in terms of specification refers to the cell’s ability to develop towards a specific fate, but it can still be influenced by the environment during specification.
