Tyrannosaurus has two proper functioning fingers plus a smaller, residual nonfunctional third finger.
The most primitive dinosaurs have five fingers on their hands. The first three fingers (I-II-III) have claws and the last two fingers (IV-V) didn't have claws.
As theropods (the group the T.rex belongs) evolved the goup lost the two non-clawed fingers (IV-V), reducing the number of fingers to three. Most theropods have three.
Nitpick: The correct abbreviation of Tyrannosaurus rex is Capital T [Dot] lower case rex.
So T.rex (Scientific names are in italics).
Other incorrect abbreviations: T rex, T Rex, T-Rex
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Allosaurus did not have horns.
Allosaurus walked on two feet.
There were many species of allosaurs. Allosaurus Fragilis, Allosaurus Atrox, and Allosaurus Amplexus, plus others. Some were nearly as large as T Rex.
Weight estimates for Allosaurus, as with any dinosaur, are difficult. Weight estimates for Allosaurus range from 2,200 lb to 8,800 lb.
Three.
There is one accepted species in the Allosaurus genus. Its full Latin (or scientific) name is Allosaurus fragilis.
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3 on each hand.
5 to 10 centimeters.
"allosaurus" (different lizard)
No descendants of Allosaurus exist today. However, birds evolved from other carnivorous dinosaurs, which were relatives of Allosaurus. Thus, the closest living relatives of Allosaurus are birds. All birds are equally related to Allosaurus.