What type of data must scientists collect to determine the motion or predict the path of a body in space

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?

What makes a dominant allele different from a recessive allele

What class of levers is shown in this image?