How the Y Makes the Guyby Patrick A. Baeuerle, Norbert Landa
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. Size D. 42 pp.
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