Total cleavage is possible in eggs

Options

A. Isolecithal
B. Mesolecithal
C. Oligolecithal
D. Telolecithal.

Answer

To determine which type of egg allows for total cleavage, we need to understand the concept of cleavage in embryonic development and the distribution of yolk in eggs. Here’s a step-by-step solution to the question:

### Step 1: Understand Total Cleavage
Total cleavage refers to the complete division of the egg during the early stages of embryonic development. This is possible when there is minimal yolk present in the egg.

**Hint:** Total cleavage occurs when the yolk content is low.

### Step 2: Analyze the Types of Eggs
We need to look at the different types of eggs mentioned in the options:

- **A. Iso-lessethyl:** This type has yolk distributed evenly throughout the egg.
- **B. Meso-lessethyl:** This type has a moderate amount of yolk present.
- **C. Oligol-lessethyl:** This type has a very small amount of yolk that is evenly distributed.
- **D. Telol-lessethyl:** This type has yolk concentrated at the poles of the egg.

**Hint:** Identify which type of egg has the least amount of yolk.

### Step 3: Determine Which Egg Type Allows Total Cleavage
From the definitions:
- Iso-lessethyl and telol-lessethyl have significant yolk, which would hinder total cleavage.
- Meso-lessethyl has a moderate amount of yolk, which also does not support total cleavage.
- Oligol-lessethyl has a very small amount of yolk, allowing for complete division of the egg.

**Hint:** Look for the egg type with minimal yolk for total cleavage.

### Step 4: Conclusion
Based on the analysis, the type of egg that allows for total cleavage is **C. Oligol-lessethyl**.

**Final Answer:** The answer is option C, oligol-lessethyl.