What gene and/or chromosome is mutated in asthma

When studying heredity, what is the relationship of dna based and traits? super urgent !

Which action occurs in the third stage of cell division a. the nuclear material of a cell is copied exactly b. the nuclear membrane disappears c. the cell forms two nuclei or d. the nuclear material separates, with half moving to wither side of the cell

What are three major influences on whether someone starts to use tobacco