Sex differences in lateralisation have been examined frequently, but have found varying and contradictory results. The experiment presented in this paper examines the lateralisation of processing positive facial emotion in 276 right handed undergraduates (138 males, 138 females). All participants completed two behavioural tests of lateralisation: a handedness preference questionnaire and a chim...

Because these practices are ethically controversial, clinics are encouraged to develop and make available their policies on the provision of nonmedical sex selection, and to accommodate their employees' decisions about whether or not to participate in such treatment. Practitioners offering assisted reproductive services are under no ethical obligation to provide or refuse to provide nonmedicall...

In mammals, the process of making sperm is marked by inactivation of sex chromosomes. Why and how does this happen? The answer apparently lies in whether a chromosome finds a pairing partner. Similar mechanisms in mold and worms reveal a surprising and recurrent theme throughout evolution.

...............................pages 2 4 TABLE OF CONTENTS..........pages 5 6 CHAPTER ONE Introduction...................page 7 General Area of Concern..................page 7 8 Purpose of the Study......................pages 8 9 The Need for Study......................pages 9 12 Statement of the Problem..................pages 12 13 CHAPTER TWO Literature Review...........................pages ...

OBJECTIVES This report presents total sex ratios at birth from 1940 to 2002, for race starting in 1970, for Hispanic origin groups starting in 1989, for live birth order starting in 1943, and for age of mother for the full time period. METHODS Descriptive tabulations of sex ratios using the birth data set are presented and interpreted. Joinpoint regression analysis is used to detect changes i...

The sex ratio of the local population influences mating-related behaviours in many species. Recent experiments show that male-biased sex ratios increase the amount of financial resources men will invest in potential mates, suggesting that sex ratios influence allocation of mating effort in humans. To investigate this issue further, we tested for effects of cues to the sex ratio of the local pop...

OBJECTIVE Previous reports suggest that maternal exposure to acute stress related to earthquakes affects the sex ratio at birth. Our aim was to examine the change in sex ratio at birth after Eastern Marmara earthquake disasters. MATERIAL AND METHODS This study was performed using the official birth statistics from January 1997 to December 2002 - before and after 17 August 1999, the date of th...