9780764150647 / 0764150642

How the y Makes the Guy (Microexplorers)


Publisher:Barron's Educational Series



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About the book:

In Barron's popular Microexplorers Series, young explorers learn how male and female cells combine when a child is first conceived--and how the genes within each cell determine the characteristics of this new living being. The way in which X and Y genes combine determine whether the child will be a boy or a girl. Full-color illustrations.

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