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Consider recessive traits on the X chromosome. Women have two of these, so it is statistically less likely that a woman would express this recessive trait and much more likely that it would be masked by a dominate X chromosome. If a male gets a recessive X from his mother ( remember, males have one X and one Y chromosome ) it is going to be expressed as there is no corresponding chromosome to mask it.

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13y ago
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Q: Why do some traits occur mainly in males even though they can be inherited only from their mothers?
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