If one parent is heterozygous for a dominant allele on an autosome and the other parent does not carry the allele, any child of theirs has a chance of being heterozygous.

Ivan is looking at a cross section of a stem taken from a vascular plant. he sees two different types of vascular tissue: the xylem, which is closer to the center of the stem, and the phloem, located around the xylem, closer to the outside of the stem. how do these two structures work together in a living plant?