sex chromosomes
Multiple and Independent Cessation of Recombination Between Avian Sex Chromosomes
... W sex chromosomes, while males have two copies of the Z ...W sex chromosomes of birds did not take place until after the split of major contemporary lineages, in the late ...two ...
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Evolutionary steps of sex chromosomes are reflected in retrogenes
... Recent reports have shown that mammalian sex chromosomes are younger than previously estimated [12, 14]. In particular, Kaessmann and colleagues presented evidence that a bias for functional retrogenes ...
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Non-Mendelian Segregation of Sex Chromosomes in Heterospecific Drosophila Males
... of sex chromosome meiotic drive have and Dobzhansky 1936; Carvalho et ...the sex chromo- overrepresentation of itself in the sperm at the expense somes rather than autosomes (Wu and Hammer 1990; of the Y ...
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Turnover of sex chromosomes in the stickleback fishes (gasterosteidae).
... XY sex chromosomes have been independently derived on LG19 and LG12 in the Gasterosteus and Pungitius lineages, ...that sex determination also arose independently in these ...XY sex ...
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Human sex chromosomes in oral and craniofacial growth
... Ninety-three Finnish females with 45,X chromosome constitution were examined to determine the frequency and expression of torus mandibularis, a bony exostosis on the lingual surface of the mandibular corpus. The results ...
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Sex-biased chromatin and regulatory cross-talk between sex chromosomes, autosomes, and mitochondria
... Hence, sex chromosome complement can be studied independent of gonadal secre- tions initiated by Sry, and the interaction between gonadal sex and sex chromosome complement can be ...of sex ...
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Human sex chromosomes in oral and craniofacial growth
... various sex chromosome anomalies, that human X and Y chromosomes contain genes (determinants) that influence final body height 1,2 and quite recent results suggest that deletions encompassing a novel ...
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Plasticity in the Meiotic Epigenetic Landscape of Sex Chromosomes in Caenorhabditis Species
... heterogametic sex in some species, sex chromosomes undergo meiotic sex chromosome inactivation (MSCI), which results in acquisition of repressive chromatin and transcriptional ...X ...
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Haploinsufficiency and the sex chromosomes from yeasts to humans
... eukaryotic sex-determination ...mating-type chromosomes of other yeasts and filamentous ...heterogametic sex determination, accumulation of HI genes on the sex chromosomes would ...
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Sex gap in aging and longevity: can sex chromosomes play a role?
... the sex gap in longevity and aging is the in- heritance of some genetic factors that differ between ...the sex chromosomes that differ between ...
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The Amylase Gene Cluster on the Evolving Sex Chromosomes of Drosophila miranda
... conformational chromosomes have evolved from a pair of originally change from a euchromatic chromosome state into a homologous autosomes (for review, see Rice ...of sex chromosome differentiation in ...Y ...
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Signatures of Sex-Antagonistic Selection on Recombining Sex Chromosomes
... ABSTRACT Sex-antagonistic (SA) selection has major evolutionary consequences: it can drive genomic change, constrain adaptation, and maintain genetic variation for ...of sex chromosomes are a ...
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Haploid Selection Favors Suppressed Recombination Between Sex Chromosomes Despite Causing Biased Sex Ratios
... by sex differences in sur- vival, biased sex ratios at flowering are common among dioecious plants with 76/243 species exhibiting signifi- cantly male-biased sex ratios and 45/243 exhibiting ...
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Evolution of reptile sex chromosomes
... the sex chromosomes o f these species using fluorescent in situ hybridisation ...no sex specific repeats can be identified, but the W o f representative elapid snakes is composed almost entirely o f ...
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Multiple gene movements into and out of haploid sex chromosomes
... the sex chromosomes have focused on model organisms with XY or ZW sex chromosomes, and we know virtually nothing about the dynamics of gene gain/loss in a third type of sex chromosome ...
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Early Development of Children With Abnormalities of the Sex Chromosomes: A Prospective Study
... ABSTRACT. Out of cytogenetic studies of 4,400 consecutive newborn infants, 1 1 were found to have abnormalities of the sex chromosomes. None had distinguishing clinical abnor- malities. [r] ...
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Mogens Westergaard’s Contributions to Understanding Sex Chromosomes
... on sex chromosomes, and species other than fungi [which do not have separate sexes and consequently do not have sex chromosomes, though mating-type loci in some fungi have suppressed ...
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MITOTIC RECOMBINATION IN THE HETEROCHROMATIN OF THE SEX CHROMOSOMES OF DROSOPHILA MELANOGASTER
... The appearance of either y or mwh marked spots in XY/Y males can result from mitotic recom- bination between (1) identical regions of the Y chromosome, one region in the Y arm[r] ...
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Effects of the sex chromosomes on early growth and development in the mouse
... of chromosomes is retained in the oocyte and the other segregates into the first polar ...maternal chromosomes remains in the oocyte while the other segregates into the second polar body (2-3 hours ...
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LINKAGE MAP OF SEX CHROMOSOMES IN THE MEDAKA, ORYZIAS LATIPES
... Although the viable YRYR male was detected without difficulty in the experiments reported previously (YAMAMOTO 1955, 1959), the actual proportion of XrYR t o YRYR [r] ...
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