Sex Determination: One for a boy, two for a girl?
نویسنده
چکیده
Sex determination in flies relies on the different ratio of X chromosomes to autosomes in XX females and XY males. Mammals have a male-determining Y-linked gene, but may retain dosage-related elements.
منابع مشابه
Human sex ratios and sex distribution in sibships of size 2.
We previously analyzed data from the U.S. National Health Interview Survey (NHIS, 1998 to 2002) on families with two biological children (10 years of age and younger) and found that the distribution of families with two boys, two girls, and one boy + one girl did not statistically conform to a binomial distribution regardless of the boy/girl sex ratio used. Using the best estimate of the sex ra...
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Almost all parents have preference to the number and sex of children, somebody like boy more and somebody like girl more. The ideal sex composition of children to most couples in China is to have one boy and one girl (Zheng, 2004), which was also true in China for the last two thousand years. If there were no limit to number of children, and if a couple had very strong sex preference of childre...
متن کاملSex Ratio at Birth in India, Its Relation to Birth Order, Sex of Previous Children and Use of Indigenous Medicine
OBJECTIVE Sex-ratio at birth in families with previous girls is worse than those with a boy. Our aim was to prospectively study in a large maternal and child unit sex-ratio against previous birth sex and use of traditional medicines for sex selection. MAIN OUTCOME MEASURES Sex-ratio among mothers in families with a previous girl and in those with a previous boy, prevalence of indigenous medic...
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BACKGROUND There are 44 million missing women in India. Gender bias; neglect of girls, infanticides and feticides are responsible. The sex ratio at birth can be used to examine the influence of antenatal sex selection on the sex ratio. MATERIALS AND METHODS Records from 321,991 deliveries at one hospital over 11 decades were utilized. The middle year in each decade was taken as representative...
متن کاملAdolescent perceptions of indirect forms of relational aggression: sex of perpetrator effects.
Different types of aggressive behavior (both physical and relational) by boys and girls have been shown to be perceived differently by observers. However, most research has focused on adult perceptions of very young children, with little research examining other ages. The aim of this study is to establish any sex differences in adolescent perceptions of indirect forms of relational aggression e...
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ورودعنوان ژورنال:
- Current Biology
دوره 5 شماره
صفحات -
تاریخ انتشار 1995