Note 3 — THE METHODS AND SCOPE OF GENETICS

An alternative and perhaps more satisfactory interpretation of the same facts has been proposed by Doncaster (Jour. Genetics I, Pt 4, p. 377). Until more progress has been made with the analysis of sexual differentiation it is not possible to decide which of the two interpretations is correct. The numerical results predicted on both systems are the same; but by introducing a more complicated though quite reasonable formula for the representation of the sex-differences Doncaster's method shows that colour-blindness may be a recessive due to the absence of a factor which produces normal colour-vision.