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A cross, or a mating of hybrids, will produce different percentages of breed characteristics, not different percentages of a breed.
They will live well beyond 12 weeks; I did lose a few between 16 and 24 weeks, apparently to flip. The one cockerel and three pullets I have kept appear healthy (but so did the flip victims); they have not developed any leg or other size related problems.
To the previous question about egg laying traits being passed from the rooster or the hen: it is acquired from both sides. There is an old wives' tale that it is passed from the male side, but that isn't true. It is true that a single rooster with good egg laying genetics will improve a flock more quickly than a single hen with good egg laying genetics, simply because the rooster's genetics will end up in a higher percentage of the chicks. Good male stock is considered more valuable because one male takes care of many females while females produce only one offspring/litter/clutch/etc. at a time.