Best Answer: Genotype frequencies are the frequencies of the homozygous dominant (AA) heterozygous (Aa) and homozygous recessive (aa). If you're using population genetics, then they are the p^2, 2pq, and q^2 values.
Petrified fossil is an organism that has been converted into stone.  Silica, iron and copper minerals can be commonly found in petrified  fossils.
A fossil is the preserved remains or trace of a plant or animal from the past. That's the simple answer to what is a fossil? Plants can be preserved with a carbon film on a piece of shale, an animal bone can be naturally replaced by minerals and preserved, or a footprint in the sand can harden into a fossil.