Ecology unit 1 Atmospheric nitrogen has to be combined with other elements or fixed in order to be used by plants lighting is one way that nitrogen is fixed when lighting occurs the extreme heat breaks the bonds on nitrogen molecules allowing nitrogen to combine with oxygen and form nitrogen oxides in what way is most of the nitrogen fixed by lighting made available for use by plants

In sweet pea, gene c is responsible for color production and gene p is responsible for the purple color pigment. both of them are located on two different loci on different chromosomes. the flowers will be purple only when the plant has the genotypes as c_p_. no color will be produced with genotypes: ccpp, ccpp, ccpp, ccpp. thus, gene c controls the expression of gene p. what pattern of inheritance is exhibited here? a. pleiotropy b. epistasis c. multiple alleles