Question:
Which of the following best explains the cleavage type in a typical teleost?
Which of the following best explains the cleavage type in a typical teleost?
Show Hint
Teleost eggs = Heavy yolk at one end (Telolecithal) $\rightarrow$ Incomplete cleavage (Meroblastic) $\rightarrow$ Restructured to blastodisc (Discoidal).
Memorize this sequence.
Memorize this sequence.
Updated On: Jul 24, 2026
- Meroblastic, Telolecithal, Discoidal
- Holoblastic, Telolecithal, Bilateral
- Meroblastic, Centrolecithal, Discoidal
- Holoblastic, Centrolecithal, Bilateral
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Cleavage patterns during early embryonic development are determined by the amount and distribution of yolk present inside the egg.
Step 2: Detailed Explanation:
Let us define the yolk and cleavage terms:
1. Telolecithal: Teleost (bony fish) eggs contain a massive amount of yolk concentrated at the vegetal pole, pushing the active cytoplasm to a small disc at the animal pole.
In contrast, centrolecithal eggs have yolk concentrated in the center (common in insects).
2. Meroblastic: Because of the dense yolk mass, cleavage furrow cannot penetrate the entire egg.
Therefore, cleavage is incomplete (meroblastic), occurring only in the active cytoplasmic region.
In contrast, holoblastic cleavage is complete and divides the entire egg (common in mammals and amphibians).
3. Discoidal: In teleosts, the cell divisions are restricted to a small dome-shaped cap of cytoplasm at the animal pole, known as the blastodisc.
This results in a disc-like cap of blastomeres lying over the yolk, which is called discoidal cleavage.
Therefore, typical teleost embryonic cleavage is best described as Meroblastic, Telolecithal, and Discoidal.
Step 3: Final Answer:
The cleavage type in a typical teleost is Meroblastic, Telolecithal, Discoidal.
Cleavage patterns during early embryonic development are determined by the amount and distribution of yolk present inside the egg.
Step 2: Detailed Explanation:
Let us define the yolk and cleavage terms:
1. Telolecithal: Teleost (bony fish) eggs contain a massive amount of yolk concentrated at the vegetal pole, pushing the active cytoplasm to a small disc at the animal pole.
In contrast, centrolecithal eggs have yolk concentrated in the center (common in insects).
2. Meroblastic: Because of the dense yolk mass, cleavage furrow cannot penetrate the entire egg.
Therefore, cleavage is incomplete (meroblastic), occurring only in the active cytoplasmic region.
In contrast, holoblastic cleavage is complete and divides the entire egg (common in mammals and amphibians).
3. Discoidal: In teleosts, the cell divisions are restricted to a small dome-shaped cap of cytoplasm at the animal pole, known as the blastodisc.
This results in a disc-like cap of blastomeres lying over the yolk, which is called discoidal cleavage.
Therefore, typical teleost embryonic cleavage is best described as Meroblastic, Telolecithal, and Discoidal.
Step 3: Final Answer:
The cleavage type in a typical teleost is Meroblastic, Telolecithal, Discoidal.
Was this answer helpful?
0
0
Top ICAR AIEEA Fisheries Science Questions
- How does climate variability influence biological productivity and fisheries sustainability?
- The density of seawater at $4^{\circ}\text{C}$ is}
- How does phytoplankton biomass impact fisheries productivity?
- What role do bio-indicators play in assessing aquatic pollution levels?
- How does water pH influence fish physiology and ecology?
View More Questions
Top ICAR AIEEA Fish Taxonomy Questions
- Nauxim bay is famous for the fishery of
- Type of caudal fin present in classes Dipnoi and Holocephali is
- Given below are two statements:
Statement (I): Rhodeus deposits eggs on the mantle cavity of freshwater mussel
Statement (II): Careproctus deposits eggs beneath the carapace of crabs
In light of the above statements, choose the most appropriate answer from the options given below. - Given below are two statements:
Statement (I): In fish, prolactin increases glomerular filtration rate in the kidney
Statement (II): In fish, prolactin functions predominately in freshwater osmoregulation
In light of the above statements, choose the most appropriate answer from the options given below. - Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A): Freshwater fishes produce a large amount of diluted urine
Reason (R): Skin has low permeability to the water and salt ions
In light of the above statements, choose the correct answer from the options given below.
View More Questions
Top ICAR AIEEA Questions
- Which of the following statements is false?
- Which of the following is an example of an inventory?
- According to Adam Smith, productivity gains could be brought about through .
- The supply curve for an artificially scarce good is .
- Which of the following would not be considered an opportunity cost of paid employment?
View More Questions