Figure 6 illustrates the four possible combinations. The offspring resulting from the self-pollination of the Fi. generation are called the second filial or F2 generation. If there are only a small number of seeds, the ratio may vary somewhat from the one given above. If a seed contains two genes for the same color, it is said to be pure for that trait and the resulting flower will show that color. Complete dominance .
Some genes are dominant and some arc essive.
Whenever a dominant and a recessive gene for a particular t occur in the same plant, the dominant gene will cause its characto show up in the plant to the exclusion of the recessive trait. Incomplete dominance . Somctimcs neither gene is dominant or essive and when they occur in the same plant, they form an interdiate characteristic. If we assume incomplete dominance in Figs. Fixing a trait .