What is the difference between fibrous protein and globular protein

Fibrous proteins are generally composed of long and narrow strands and have a structural role.

Globular proteins generally have a more compact and rounded shape and have functional roles.

Explanation:

fibrous proteins ARE something, whereas globular proteins DO something.

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).