منابع مشابه
Sex-Determination and Sex-Differentiation in Mammals.
only when the compound capable of tautomerization is in the liquid phase, or in solution. And that is just the case with the free radicals under consideration. 6. The two radicals, a-naphthyl-diphenylmethyl and a-naphthylxanthyl, were found to give a molecular weight less than that calculated for the monomolecular phase. Schlenk and Renning's" results show that a-naphthyl-biphenyl-phenylmethyl ...
متن کاملGerm cell sex determination in mammals
One of the major decisions that germ cells make during their development is whether to differentiate into oocytes or sperm. In mice, the germ cells' decision to develop as male or female depends on sex-determining signalling molecules in the embryonic gonadal environment rather than the sex chromosome constitution of the germ cells themselves. In response to these sex-determining cues, germ cel...
متن کاملSex determination and gonadal development in mammals.
Arguably the most defining moment in our lives is fertilization, the point at which we inherit either an X or a Y chromosome from our father. The profoundly different journeys of male and female life are thus decided by a genetic coin toss. These differences begin to unfold during fetal development, when the Y-chromosomal Sry ("sex-determining region Y") gene is activated in males and acts as a...
متن کاملAn Overview of Sex Selection at Conception in Mammals
Although the mechanisms under which sex ratio is controlled in nature remain unknown, researchers have attempted to treat sperm in an effort to predetermine the sex of the offspring. The methods of sperm separation that have been repeatedly reported to isolate fractions rich in X- or Y-chromosome bearing sperm are serum albumin gradient swim-up and flow cytometry. However, the ability of the se...
متن کاملThe end of gonad-centric sex determination in mammals.
The 20th-century theory of mammalian sex determination states that the embryo is sexually indifferent until the differentiation of gonads, after which sex differences in phenotype are caused by the differential effects of gonadal hormones. However, this theory is inadequate because some sex differences precede differentiation of the gonads and/or are determined by non-gonadal effects of the sex...
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ژورنال
عنوان ژورنال: Seibutsu Butsuri
سال: 1987
ISSN: 0582-4052,1347-4219
DOI: 10.2142/biophys.27.75