To see the fully FGDC compliant version of this metadata click here. Abstract: Hydric Soils are those that are wet at or near the ground surface for significant periods of the growing season. Digital data consists of mapping units of the various soil types found in Loudoun County, Virginia.
Sex Organs Are Visible. Although your baby's gender is determined immediately upon fertilization, you will not be able to know the sex until about the 16th to 18th week of pregnancy. At around the sixth week your baby will develop a small bud called the genital tuber at the site of the genitals.
Embryological and Fetal Events. Sex is determined by the sex chromosomes at conception; females have two X chromosomes and males have an X and a Y chromosome. Sexual Differentiation of the Reproductive System. The gonads of both males and females begin to develop during week 5 of gestation. During week 7 the gonads begin to become testes in males, and in week 8 they begin to form ovaries in females. The external genitalia arise from the same structures in both sexes, with differentiation occurring in week 8.