Search results
Results From The WOW.Com Content Network
The causes of gender incongruence have been studied for decades. Transgender brain studies, especially those on trans women attracted to women ( gynephilic ), and those on trans men attracted to men ( androphilic ), are limited, as they include only a small number of tested individuals. [ 2 ]
Sex-related illnesses have various causes: [citation needed] Sex-linked genetic illnesses; Parts of the reproductive system that are specific to one sex; Social causes that relate to the gender role expected of that sex in a particular society; Different levels of prevention, reporting, diagnosis or treatment in each gender
Males become externally distinct between 8 and 12 weeks, as androgens enlarge the genital tubercle and cause the urogenital groove and sinus to fuse in the midline, producing an unambiguous penis with a phallic urethra, and the labioscrotal swellings become a thinned, rugate scrotum where the testicles are situated. Dihydrotestosterone will ...
These genetic abnormalities occur during the prenatal stage of an individual's fetal development. During this stage, genetic mutations can result from endocrine disrupters in the mother's diet or environmental factors. [18] The general causes of sexual anomalies can not be outlined due to the high variability of each individual's situations.
According to this one theory the cause for this is a higher frequency of genetic recombination in females than in males, possibly due to sex-linked genes, and as a result females tend to show less phenotypical variation in any given population. [59] [60] [61]
Genetic variation can be identified at many levels. Identifying genetic variation is possible from observations of phenotypic variation in either quantitative traits (traits that vary continuously and are coded for by many genes, e.g., leg length in dogs) or discrete traits (traits that fall into discrete categories and are coded for by one or a few genes, e.g., white, pink, or red petal color ...
Females may compete for high-quality mates who possess traits that indicate underlying genetic quality, possibly including physical attractiveness and intelligence, [95] or material resources that can enhance the survival and reproductive success of the female and her offspring.
The study of human genetic variation has evolutionary significance and medical applications. It can help scientists reconstruct and understand patterns of past human migration. In medicine, study of human genetic variation may be important because some disease-causing alleles occur more often in certain population groups.