Aphenotype that results from a dominant allele must have at least dominant allele(s) present in the parent(s).

One dominant allele

Explanation:

Two alleles are needed in any one locus, and they can either be dominant or recessive. Since a dominant allele will hide the expression of the recessive allele, only one dominant allele is needed in the parents. In other words, one parent must contribute a dominant allele and the other parent can contribute either a dominant or a recessive allele. The resulting phenotype will have the dominant phenotype in all cases.

interphase

the period of cell growth when the cell synthesizes new molecules and organelles. the cell is not dividing and it constitutes the majority of the time spent in the cell cycle

prophase

changes occur in the nucleus and cytoplasm. the chromatin condenses to form structures (sister chromatids) visible with a light microscope and the mitotic spindle begins to form, but the nucleus is still in tact

prometaphase

the nuclear envelope fragments and the spindle microtubules attach to the kinetochores of the sister chromatids

metaphase

all the cell's duplicated chromosomes are lined up at an imaginary plane equidistant between the poles of the mitotic spindle

anaphase

begins when sister chromatids separate from each other and ending when a complete set of daughter chromosomes arrives at each of the two poles of the cell

telophase

the daughter nuclei form at the two poles of a cell

cytokinesis

the division of a cytoplasm to form two separate daughter cells. usually occurs during telophase during mitosis. this and mitosis make up to mitotic (m) phase of the cell cycle