In mice, single-gene mutations lead to obesity. The Ob gene codes for the protein leptin, a satiety factor that signals the brain when enough food has been consumed. The recessive ob- allele is a loss-of-function allele, so ob-/ob- mice do not secrete leptin into veins and capillaries; they do not experience satiety and therefore become obese. Leptin is...

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

linnaeus is the father of taxonomy

explanation:

which is the system of classifying and naming organisms. one of his contributions was the development of a hierarchical system of classification of nature. today, this system includes eight taxa: domain, kingdom, phylum, class, order, family, genus, and species.

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.

answer; three;