what color will the child's skin be?
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The child (generation 3) will be black, because being an albino is recessive. The two black grandparents (generation 1) passed the genes for black skin to the albino child (generation 2), even though that child did not express those genes. When that child breeds with a person who does not have the albino gene then the generation three child gets one albino and one regular allele so they have normal pigment expression. Since black pigment is dominant, the child will be black, although there are several genes that code for skin color so the effect will be more like blending, due to the one white parent. Thus, the child will be darker than both its parents, but lighter black than its black grandparents.