The ability to roll your tongue is a dominant trait and the alleles are symbolized by R and r. Four siblings are genetically tested, and it is found that the genetic ratio is 2:2:0.

my teacher would say no s

mass and weight are closely related because mass affects the weight of an object experiencing the effects of gravity. weight is the measure of the force of gravity on an objects's mass, while mass is the measure of how much matter there is in an object.

segmented body, an exoskeleton made from chitin, and joint appendages.