No evidence for sex-linked or sex-limited gene expression influencing spatial orientation

No evidence for sex-linked or sex-limited gene expression influencing spatial orientation.

Scores of 83 pairs o f twins and their parents on the Cubes Comparison Test have been analyzed to test competing hypotheses about the origin o f individual differences in spatial orientation. Models allowing for polygenic sex-linked or sex-limited gene expression show no improvement in fit over the simple autosomal additive polygenic model. However, individual environmental influences (E 1) acc...

Sex or no sex: Evolutionary adaptation occurs regardless

All species continuously evolve to adapt to changing environments. The genetic variation that fosters such adaptation is caused by a plethora of mechanisms, including meiotic recombination that generates novel allelic combinations in the progeny of two parental lineages. However, a considerable number of eukaryotic species, including many fungi, do not have an apparent sexual cycle and are cons...

Condoms for sex work: protection or evidence?

Prenatal sex determination in suspicious cases of X-linked recessive diseases by the amelogenin gene

Objective(s):To determine the fetal discernment in suspected cases of sex linked recessive disease in the first trimester of pregnancy. Materials and Methods: After collection of 100 Chorionic Villi samples, the DNAs were extracted and baby gender was determined. Meanwhile, after increasing the sensitivity, the system was able to detect the sex of each cell which was obtained by biopsy. Resul...

Sex chromosomes, sex determination, and sex-linked sequences in Microtidae.

The Arvicolidae is a widely distributed rodent group with several interesting characteristics in their sex chromosomes. Here, we summarize the actual knowledge of some of these characteristics. This mammalian group has species with abnormal sex determination systems. In fact, some species present the same karyotype in both males and females, with total absence of a Y chromosome, and hence of SR...