I. Complexion II. Height III. Blood Rh factor IV. Colour blindness Which of the above human characteristics are discontinuous variations?

The human characteristics that are discontinuous variations are III and IV only, which is option IV. Discontinuous variations are traits that can be classified into distinct categories with no intermediate values. In other words, individuals can be placed into specific groups based on the presence or absence of a particular characteristic. Blood Rh factor is a discontinuous variation because individuals can be classified as either Rh-positive or Rh-negative, with no intermediate values. Similarly, color blindness is also a discontinuous variation because individuals can be classified as either color-blind or not color-blind. Complexion and height, on the other hand, are continuous variations because they show a range of intermediate values between two extremes. For example, complexion can range from very light to very dark, with many intermediate shades in between. Height can also vary along a continuum, with individuals ranging from very short to very tall. Therefore, the human characteristics that are discontinuous variations are III and IV only, which is option IV.