The main stem of the Bay itself is about 189 miles (304 km) long, from the Susquehanna River in the north to the Atlantic Ocean in the south. At its narrowest point near Annapolis, Maryland, the Bay is 4 miles (6.4 km) wide; at its widest point, near the mouth of the Potomac River, it is 30 miles (50 km) wide.
Patau syndrome. Patau syndrome is a syndrome caused by a chromosomal abnormality, in which some or all of the cells of the body contain extra genetic material from chromosome 13. The extra genetic material disrupts normal development, causing multiple and complex organ defects.
If the non-sex chromosomes (autosomes) fail to separate properly, the results are usually fatal and the pregnancy is not carried out. When autosomal non-disjunctions do lead to birth, the individual will carry a third chromosome. Trisomy 21 causes Down syndrome. Trisomy 13 results in Patau syndrome. Trisomy 18 leads to Edward's syndrome.