J. J. Thomson concluded what from his experiment

Ahypothesis that has been tested again and again , with similar results each time may become a law , true or false

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?

Which is one example of a phenotypic change that is not genetic