Piebald spotting is a condition found in humans in which there are patches of skin that lack pigmentation. the condition results from the inability of pigment- producing cells to migrate properly during development. two adults with piebald spotting have one child who has this trait and a second child with normal skin pigmentation. a. is the piebald spotting trait dominant or recessive? what information led you to this answer? b. what are the genotypes of the parents?

Hydrilla (hydrilla verticillata) is an invasive aquatic plant and one of the most serious aquatic pests in florida. hydrilla has already been introduced to hundreds of bodies of water throughout florida, hydrilla is difficult to control because it grows rapidly and survives in many different water depths and conditions. hydrilla • describe how hydrilla affects native plant and animal species. include both a biotic and an abiotic limiting factor. • suggest one biotic and one abiotic recommendation that could slow the spread of hydrilla