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为什么单交换最多只能产生50%重组基因型？

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Elizabeth Budy

1只会打鸣的母鸡与1只正常的母鸡交配，后代产生怎样的性别比例？已知无Z染色体的卵是死蛋，不能孵化。

1t can be inferred from the text that _________ .
[ A] electronic games are less harmful than television
[ B] television viewers are more realistic than gamers
[ C] television is more popular than electronic games
[ D] gamers have less self-control than TV viewers

— _ may I ___the book？
—For three weeks.
[ A] How often; borrow
[ B ] How often; keep
[ C] How long; borrow
[ D] How long; keep