Interspecific hybrid animals are fertile or sterile?
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Because, normally, the chromosome of the fathers and mothers are not "compatible" so they cannot be "divide" into the sperm and egg, which result in the sperm and/or egg is not created or does not become a new being.
For example (a VERY rough example): The father have Aa and the mothers have Bb. Normally we would have the sperm A and a and an egg of B or b, and these sperm and egg normally would not become a baby. In some case, though, it does, and we have Ab or AB or ab or aB. But this baby cannot create A sperm or B sperm or anything like that, though you may found it strange. The cell can duplicate (which mean the baby can grow) because the old cell of Ab for example would result in two new cells both of Ab, each chromosome divide "on its own". When create sperm or egg, however, the chromosome from the same pair need to be "compatible", which the hybrid baby lack
When the polyploid-making agents is introduced, it duplicate EACH chromosome, and we have a hybrid of AAbb. Now the two A chromosome is compatible with each other, and so is the two b, and the hybrid is now fertile.
For example (a VERY rough example): The father have Aa and the mothers have Bb. Normally we would have the sperm A and a and an egg of B or b, and these sperm and egg normally would not become a baby. In some case, though, it does, and we have Ab or AB or ab or aB. But this baby cannot create A sperm or B sperm or anything like that, though you may found it strange. The cell can duplicate (which mean the baby can grow) because the old cell of Ab for example would result in two new cells both of Ab, each chromosome divide "on its own". When create sperm or egg, however, the chromosome from the same pair need to be "compatible", which the hybrid baby lack
When the polyploid-making agents is introduced, it duplicate EACH chromosome, and we have a hybrid of AAbb. Now the two A chromosome is compatible with each other, and so is the two b, and the hybrid is now fertile.
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