Results 161 to 170 of about 534,598 (215)
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Current Opinion in Pediatrics, 2001
The biology of the X chromosome is unique, as there are two Xs in females and only a single X in males, whereas the autosomes are present in duplicate in both sexes. The presence of only a single autosome, which can occur as a result of an error in meiotic segregation, is invariably an embryonic lethal event.
S M, Gartler, M A, Goldman
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The biology of the X chromosome is unique, as there are two Xs in females and only a single X in males, whereas the autosomes are present in duplicate in both sexes. The presence of only a single autosome, which can occur as a result of an error in meiotic segregation, is invariably an embryonic lethal event.
S M, Gartler, M A, Goldman
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Science, 1995
In many species, females possess two X chromosomes and males have one X chromosome. This difference is critical for the initial determination of sex. However, the X encodes many functions required equally in males and females; thus, X chromosome expression must be adjusted to compensate for the difference in dosage between the sexes ...
R L, Kelley, M I, Kuroda
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In many species, females possess two X chromosomes and males have one X chromosome. This difference is critical for the initial determination of sex. However, the X encodes many functions required equally in males and females; thus, X chromosome expression must be adjusted to compensate for the difference in dosage between the sexes ...
R L, Kelley, M I, Kuroda
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Pathology, 1983
Publisher Summary The fragile X chromosome is associated with a common form of X-linked mental retardation in males and possibly females. The fragile X is so called because it has a fragile site at the distal end of the long arm. Fragile sites are morphological features of chromosomes defined as specific points liable to show some specific features ...
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Publisher Summary The fragile X chromosome is associated with a common form of X-linked mental retardation in males and possibly females. The fragile X is so called because it has a fragile site at the distal end of the long arm. Fragile sites are morphological features of chromosomes defined as specific points liable to show some specific features ...
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Chromosome imprinting and the mammalian X chromosome
Nature, 1975Chromosome imprinting is the process by which one of two genetically homologous chromosomes is predetermined to function differently from the other at a subsequent stage in development. In the coccid insects, imprinting occurs in the egg, at the time of fertilisation; it probably occurs at the same time and site in mammals, and possibly also in Sciara.
H S, Chandra, S W, Brown
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Inactivation of the X-Chromosome
New England Journal of Medicine, 1972IN its classic form, the hypothesis of X-chromosome inactivation holds that only one of the two X-chromosomes present in cells of female mammals is functional. The "decision" of which X-chromosome is to operate in a cell occurs quite early in embryogenesis and, once made, is irreversible for that cell and all its progeny.
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The X Chromosome and the Ovary
Journal of the Society for Gynecologic Investigation, 2001X chromosome abnormalities are the leading identifiable cause of premature ovarian failure (POF). POF-related abnormalities range from the complete absence of one X chromosome to assorted deletions and translocations to mutations in specific genes.
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Mammalian Genome, 1997
Overall, the probe map fromDXWas70 toAmg encompasses 72 cM and includes 103 loci. Eight of these have been designated reference loci (see Table 2 and previous section) on account of their wide usage that would enable the cross reference of independent maps created in different laboratories.
Y, Boyd +6 more
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Overall, the probe map fromDXWas70 toAmg encompasses 72 cM and includes 103 loci. Eight of these have been designated reference loci (see Table 2 and previous section) on account of their wide usage that would enable the cross reference of independent maps created in different laboratories.
Y, Boyd +6 more
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BioEssays, 2001
AbstractThere is new and convincing evidence(1) that the mammalian X chromosome, as well as the Y chromosome, contains an atypically high proportion of genes involved in sex and reproduction (SRR genes). Here we consider alternative explanations for this concentration.
J A, Graves, M L, Delbridge
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AbstractThere is new and convincing evidence(1) that the mammalian X chromosome, as well as the Y chromosome, contains an atypically high proportion of genes involved in sex and reproduction (SRR genes). Here we consider alternative explanations for this concentration.
J A, Graves, M L, Delbridge
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