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The darkly pigmented end of a Xenopus (frog) egg is the ____________pole and will become the future _ __________ of the frog

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The darkly pigmented end of a Xenopus(Frog) egg is the animal  pole and will become the future anterior of the frog.

Immediately after fertilization, the darkly pigmented animal pole placed above and the yolk-laden vegetal pole below. Before the release of egg into the water' the jelly coat remains thin. As the egg is released into the water, the jelly coat absorbs water and begins to swell until the thickness of the jelly becomes twice the diameter of the egg. The second maturation division is completed immediately after fertilization. As a result, the fertilized egg releases the second polar body. The egg pronucleus and sperm pronucleus fuse together to form the zygotic nucleus. This process is called amphimixis. On one side just below the equator, a crescent like area appears; it will be grey in colour. This area is called grey crescent. It appears opposite to the point of sperm entry. The region of the grey crescent will become the posterior side and the opposite region will become the anterior side of the future embryo. This leads to the formation of a definite bilateral symmetry in the fertilized egg. .The unfertilized egg is radially symmetrical

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