Figure 117

Checkerboard Diagram for Sex Determination

The male parent contributes an X-and a Y-chromosome. The female contributes two X-chromosomes. The result is an equal proportion of males and females in each generation.

FIGURE 1.18 The X- and Y-Chromosomes Are Not of Equal Length

The X- and Y-chromosome are not of equal length. The Y-chromosome lacks many genes corresponding to those on the X-chromosome. Therefore males have only one copy of these genes because they have only one X-chromosome.

Mother

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