Fill in the following table: Table 1: Number of Events for each Era
Era
Number of Events
Precambrian
Paleozoic
Mesozoic
Cenozoic
Total

Guinea pig coat color is determined by a single gene. the allele for black coat color is dominant to brown. in a cross between twoblack-haired guinea pigs, 20 offspring are born. if both parents were heterozygous, probability would predict that approximately howmany of the 20 offspring would have brown hair?