As the initial cleavage divisions proceed in a frog embryo, what happens next?

Answer 1

Cleavage divisions lead to formation of blastula.

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After fertilisation of egg by sperm, cleavage divisions begin.

Cleavage involves mitosis of cells in early embryo in rapid succession without intermittent growth phases. This helps in establishing normal nuclear cytoplasmic ratio (as the zygote is associated with more cytoplasmic mass compared to the nuclear volume of cell).

At the end of cleavage divisions a hollow ball of cells appear, which is called blastula . The cavity inside blastula is called blastocoel.

Blastula later undergoes gastrulation , another embryonic event: to establish three germ layers of frog's body.

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Answer 2

The blastula forms, followed by gastrulation, where cells migrate to form three germ layers: ectoderm, mesoderm, and endoderm. The notochord and neural tube develop, establishing the basic body plan.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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