Identify the independent variable in the experiment represented in Figure 3B. Justify the use of hair from individuals unaffected with FT as the control in the experiment represented in Figures 3A and 3B . Based on the data in Figure 3B, describe the FT effect of the disorder on the proportion of hairs in the growth phase. Based on Figure 2, if individuals 3 and 4 have another child, calculate the probability that the child will be affected.