Fig. 17.5. Loss of an X-chromosome during mitosis in a 2A + XX cell, leading to the derivation of two daughter cells, one having 2A + XX and the other having 2A + X.
Fig. 17.6. Sexual dimorphism in Drosophila melanogaster and Coenorhabditis elegans; in Drosophila, body size, abdominal pigmentation and sex comb on the foreleg are major external features for differentiating two sexes; in C. elegans, presence of copulatory organs in the tail of male, presence of two armed gonads in hermdphrodite (one armed in male) and larger size of the hermaphrodite are used for differentiating the two forms (modified from Hodgkin, 1990).