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It can happen because the different number of chromosomes in parent species results in an odd number of chromosomes for the offspring, leading to problems with genome distribution in sexual cells.

This happens, for example, with mules.

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15y ago
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14y ago

I just had to do that for my Homework, and it is this: they would never be able to produce another non-hybrid, it could only produce hybrids like itself. like in this diagram : a + b = c= c= c c could never produce another a or b . sorry if that confused you!

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9y ago

Many F1 hybrids are sterile. It takes years of cross breeding to create one that breeds true.

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Q: Why don't F1 hybrids breed true?
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