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Most species show an equal proportion of individuals of both sexes. In  diploid species sex ratio is determined by a genic balance between sex  chromosomes. In Drosophila sex is determined by the ratio of X- chromosomes  versus autosomes and in some species of the genus it is related to the  presence of an inversion in the sex chromosome. The present work analyses the  sex ratio in 27 natural populations of Drosophila pseudoobscura that inhabit  Mexico. Female flies captured in nature were counted and their sex ratio  calculated and been called generation P, then cultured individualy, allowed  to leave adult offspring which was quantified in order to get its sex ratio  and designated generation F1. sex ratio was calculated using the expression:  number of males times 100 divided by the number of females proposed by Darwin  (1871). The sex ratio of each population was taken using the average of all  the individual counts from each sample. The values found varied among  different generations and populations, so for generation P their values  varieded 37.4 to 190.4 and in generation F1 from 31.3 up to 96.4 males for  each 100 females. According to their geographical distribution four North to  South transects were arranged and in them means varied from 60.8 to 81.7  males for each 100 females. All this means that in Mexican population are  more females than males, exceptionally more males than females

Sex ratios in natural populations of Drosophila pseudoobscura from Mexico