نتایج جستجو برای: male female ratio
تعداد نتایج: 956573 فیلتر نتایج به سال:
being either underweight or overweight can affect a woman's fertility. irregular menstrual cycles, reduced spontaneous and assisted fertility and an increased risk of miscarriage are risks associated with obesity that are often overlooked. excessive weight and central distribution of body fat are both related to an increased risk of normogonadotrophic anovulation. weight loss can re-establish o...
Female-biased sex ratio in local mate competition has been well studied both theoretically and experimentally. However, some experimental data show more female-biased sex ratios than the theoretical predictions by Hamilton [1967. Science 156, 477-488] and its descendants. Here we consider the following two effects: (1) lethal male-male combat and (2) time-dependent control (or schedule) of sex ...
BACKGROUND High sex ratios at birth (SRB) are seen in China, Taiwan, South Korea, parts of India and Vietnam. The imbalance is the result of son preference, accentuated by declining fertility. Prenatal sex determination and female feticides are common in many countries. It is reflected in sex ratio OBJECTIVE To determine reasons for the preferences for different sex; to find out whether there...
The main purpose of this paper is to investigate the impact of gender inequality in education on rural poverty in Pakistan using Logit regression analysis on primary data sets. It is concluded that gender inequality in education has adverse impact on rural poverty. The empirical findings suggest that female-male enrolment ratio, female-male literacy ratio, Female-male ratio of total years of sc...
within the components of communicative competence, a special emphasis is put on the “rules of politeness,” specifically the politeness strategies (brown and levinson, 1978) that speakers deploy when performing the request speech act. this is because the degree of imposition that making a request places upon one’s interlocutor(s) has been seen to be influenced by several factors among which, as ...
the speech act of disagreement has been one of the speech acts that has received the least attention in the field of pragmatics. this study investigates the ways power relations, social distance, formality of the context, gender, and language proficiency (for efl learners) influence disagreement and politeness strategies. the participants of the study were 200 male and female native persian s...
abstract the main purpose of this study was to investigate whether there was any significant difference between the speaking achievement of learners who were trained by means of consciousness raising of sociolinguistic skills and that of learners who were trained without the above mentioned task. the participants of this study consist of 60 intermediate level students participating languag...
many of insects have re-mating behavoiur during their reproductive period. the re-mating phenomenons have been observed in many ladybirds, too. in current study, the change of proportion of male to female (sex ratio) was used in order to changing of possibility and times of re-mating in hippodamia variegata. in previous studies it has been indicated that males make up about 50% of this predator...
Sex-ratio distorters are found in numerous species and can reach high frequencies within populations. Here, we address the compelling, but poorly tested, hypothesis that the sex ratio bias caused by such elements profoundly alters their host's mating system. We compare aspects of female and male reproductive biology between island populations of the butterfly Hypolimnas bolina that show varying...
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