Members of the family Cimicidae (Heteroptera: Cimicomorpha) are temporary bloodsuckers on birds and bats as primary hosts and humans as secondary hosts. Acanthocrios furnarii (2n=12=10+XY, male) and Psitticimex uritui (2n=31=28+X1X2Y, male) are two monotypic genera of the subfamily Haematosiphoninae, which have achiasmatic male meiosis of collochore type. Here, we examined chromatin organizatio...

The ribonucleoprotein Male Specific Lethal (MSL) complex is required for X chromosome dosage compensation in Drosophila melanogaster males. Beginning at 3 h of development the MSL complex binds transcribed X-linked genes and modifies chromatin. A subset of MSL complex proteins, including MSL1 and MSL3, is also necessary for full expression of autosomal heterochromatic genes in males, but not fe...

The presence of an extra sex chromosome is associated with an Background increased rate of neurodevelopmental difficulties involving language. Group averages, however, obscure a wide range of outcomes. The 'double hit' hypothesis proposes that the adverse impact of Hypothesis: the extra sex chromosome is amplified when genes that are expressed from the sex chromosomes interact with autosomal va...

The presence of an extra sex chromosome is associated with an Background increased rate of neurodevelopmental difficulties involving language. Group averages, however, obscure a wide range of outcomes. The 'double hit' hypothesis proposes that the adverse impact of Hypothesis: the extra sex chromosome is amplified when genes that are expressed from the sex chromosomes interact with autosomal va...

Genetic mechanisms of sex determination are unexpectedly diverse and change rapidly during evolution. We review the role of genetic conflict as the driving force behind this diversity and turnover. Genetic conflict occurs when different components of a genetic system are subject to selection in opposite directions. Conflict may occur between genomes (including paternal-maternal and parentalzygo...

the study of cognition and attitudes toward family life and sex, particularly among the young population, is one of the important areas of health behavior. this study attempts to find the degree of knowledge and attitudes of the female students of teheran university. the findings reveal that although the girls under the study expressed some attitudes towards family life not common in the tradit...

A genetical model is formulated in which the sex ratio in broods and the relative size of broods are determined by the genotype at an autosomal locus. The results also apply to the case in which the sex-ratio locus is sex linked and expressed in the homogametic sex and to the case in which the locus is expressed in the diploid sex of a haplodiploid organism. Fisher (1930) argued that the sex ra...