Factors Causing Sex differences in Birds
نویسندگان
چکیده
منابع مشابه
Sex Reversal in Birds.
Sexual differentiation in birds is controlled genetically as in mammals, although the sex chromosomes are different. Males have a ZZ sex chromosome constitution, while females are ZW. Gene(s) on the sex chromosomes must initiate gonadal sex differentiation during embryonic life, inducing paired testes in ZZ individuals and unilateral ovaries in ZW individuals. The traditional view of avian sexu...
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BACKGROUND AND PURPOSE Our objective was to identify factors that contribute to or modify the sex difference in poststroke functional outcome. METHODS Ischemic strokes (n=439) were identified from the Brain Attack Surveillance in Corpus Christi (BASIC) Project (2008-2011). Data were ascertained from interviews (baseline and 90 days post stroke) and medical records. Functional outcome was meas...
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T H E adult male in any species is generally recognised as being a larger and heavier animal than the adult female. Donaldson gives the weight of a male rat as 279.9 gms. and of the female as 230.4 gms. at 365 days, presumably fully grown. It also appears to be accepted that the metabolism of the male is different from that of the female. Possibly this is quite correct, for the functions of the...
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ژورنال
عنوان ژورنال: Avian Biology Research
سال: 2011
ISSN: 1758-1559,1758-1567
DOI: 10.3184/175815511x13070045977959