A: In frog,a gray crescent is formed during f | vedclass

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(A) The gray crescent is a surface feature of the amphibian embryo,specifically in frogs,formed during fertilization.When the sperm enters the egg in

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Assertion and Reason both are correct and Reason is the correct explanation of Assertion.

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(A) The gray crescent is a surface feature of the amphibian embryo,specifically in frogs,formed during fertilization.When the sperm enters the egg in the animal hemisphere,the cortical cytoplasm rotates relative to the inner cytoplasm.This rotation causes the dark pigment granules (melanin) to shift away from the site of sperm entry,exposing the lighter-colored cytoplasm underneath.This exposed area appears as a gray-colored crescent,known as the gray crescent,located exactly opposite to the point of sperm entry.Therefore,both the Assertion and the Reason are correct,and the Reason provides the correct explanation for the formation of the gray crescent.

$A$: In frog,a gray crescent is formed during fertilization.
$R$: It is because the black pigment granules move away from the point of entry of the sperm in the animal half.

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$A$: In frog,a gray crescent is formed during fertilization.$R$: It is because the black pigment granules move away from the point of entry of the sperm in the animal half.