Beginning of Essay
The objectives of this article as I saw them were, (1) to show how fetal gonads acquire the ability to function as endocrine organs, and (2), to show the mechanisms by which the endocrine secretions modulate male development. The researchers went through an extr ....

Middle of Essay
.... phenotypes. The male phenotype is induced and will not manifest if the proper secretions are not made from the testis. Although the article fails to mention how, "Jost deduced that two secretions from the fetal testis are essential for male development - Mullerian-inhibiting substance and androgen." The mechanism in which spermatogenic tubules form Mullerian-inhibiting substance is still unclear to scientists. Problems with improper levels of this hormone result in genetic and phenotypic reproductive disorders. The other hormone secreted by the testis is testosterone. It has two functions; it promotes maturation of the spermatogenic tubules (an ....