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background information
The cleavage of the frog embryo during the embryo development is holoblastic (complete cleavage). However when we look at yolk-rich eggs we see a cleavage pattern which is meroblastic (partial cleavage).

Question
But the frog eggs are also yolk rich right? So why do frog embryo's use holoblastic cleavage?

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Because:

  1. Frog eggs are not yolk-rich. They are mesolecithal, they have an intermediate amount of yolk.
  2. Yolk is concentrated within vegetal pole of the egg. That is why yolk-packed macromeres divide much slower than micromeres on the vegetal pole, which barely contain any yolk. Amphibians cleavage

My sources:

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