Like trisomy 21, mosaic Down syndrome is not inherited. It occurs as a random event during cell division early in fetal development. As a result, some of the body's cells have the usual two copies of chromosome 21, and other cells have three copies of this chromosome.
1 An average cost for a cubic yard of concrete is $75 to $125, depending on how much is needed and local prices. 2  Labor costs to pour and form concrete run somewhere around $3.50 to $7.00 per square foot.3  One homeowner paid $11,000 for a crawl space for a 1,500 square foot home. An average cost for a cubic yard of concrete is $75 to $125, depending on how much is needed and local prices. 2  Labor costs to pour and form concrete run somewhere around $3.50 to $7.00 per square foot.
In the following table the Labor Cost figure is what the able and prepared DIY persons should expect to save by performing the corresponding tasks. Exposed aggregate concrete: 500 sq.ft. surface; excavate, prepare, pour, and wash-finish a 2 thick concrete slab with rebar, wire mesh, and aggregate/sand base. Include costs for miscellaneous material, transport, equipment, and waste. These prices are for service in the immediate area of the provider.