Which type of cleavage is found in frog?

Options

A. Holoblastic
B. Teloblastic
C. Spiral
D. Biradial

Answer

**Step-by-Step Solution:**

1. **Understanding Cleavage**: Cleavage is the process of cell division that occurs after fertilization, where the zygote divides to form multiple cells. This process is crucial for the early stages of embryonic development.

2. **Identifying Egg Type**: Frogs have what is known as a microlacethal egg, which means that the amount of yolk present in the egg is very low. The presence of low yolk influences the type of cleavage that occurs.

3. **Type of Cleavage in Frogs**: Due to the low yolk content, the cleavage in frogs is classified as holoblastic. Holoblastic cleavage means that the entire egg divides equally during the cleavage process.

4. **Process of Holoblastic Cleavage**: In holoblastic cleavage, the zygote divides into two equal cells, then those two cells divide into four equal cells, and this process continues, resulting in a uniform distribution of cells.

5. **Comparison with Other Types of Cleavage**: It is important to note that other types of cleavage exist, such as teloblastic cleavage (seen in birds with macrolacethal eggs that have a high yolk content) and spiral cleavage (seen in mollusks and annelids). However, these are not applicable to frogs.

6. **Conclusion**: Therefore, the type of cleavage found in frogs is holoblastic cleavage due to the low amount of yolk in their eggs.

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