SEX RATIOS IN DROSOPHILA AMPELOPHILA

Coincidence of Crossing over in DROSOPHILA MELANOGASTER (AMPELOPHILA).

PAGE INTRODUCTION .................................................................. I35 Coincidence of widely separated regions. , 138 Coincidence in the second chromosome. 146 Coincidence in the third chromosome. 148 Coincidence in other forms 148 The mechanism of crossing over 148 Triple crossing over .: .. I49 Maximum and minimum coincidence. I53 The distance between the breaking points in ...

Sex ratios.

Jennions et al. introduce the different kinds of sex ratio and their biology.

Sex ratios in primate groups

Changing sex ratios in diabetes.

A survey of sexes and ages in patients attending the Hartlepool diabetic clinic was carried out for the 20-year period 1948-67. The proportion of men aged 50 and over rose from 25.9% in the first decade to 38.2% in the second. An attempt has been made to explain this pronounced and rapid change.

Declining sex ratios in Canada.

OBJECTIVE To examine the trends in the proportion of annual live births that were male in Canada and to compare the trends with those in the United States. DESIGN Analysis of census data. SETTING Canada as a whole and 4 main regions (West, Ontario, Quebec and Atlantic). SUBJECTS All live births from 1930 to 1990. OUTCOME MEASURES Sex ratio (expressed as the proportion of total live birt...