Figure 2.
A sample incomplete
pedigree chart to illustrate sex determination. Each vertical
line indicates an offspring. By tossing a coin to decide whether
the father's X or Y chromosome is passed onto his offspring,
the gender of the offspring is determined, and square, for male, XY,
and circle for female, XX, can be drawn below each of the vertical
lines. Any one pedigree chart can have all male, all female
or any ratio in between. For a large enough class, with ~ 30 students
or more, the ratio of males to females should be close to
50:50.
Back to Learning Mendelian Genetics through a Coin Toss Game
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