Question

A breeder wants to maintain a heterozygous hybrid's superior performance through commercial seed production. However, the next generation from saved hybrid seed may segregate and lose uniformity. Which reason best explains this?

A F1 hybrids contain no genes
B F2 plants cannot photosynthesize
C Hybrid vigor is caused only by fertilizers
D F1 hybrids are genetically uniform but F2 progeny segregate
E All F2 plants are always genetically identical
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