Characteristics and Examples of Fossil Formation. The many different ways organisms are preserved gives fossils different characteristics. Let's explore a few ways fossils can form. Permineralization is when an organism dies and sediment enters the body, filling in the pores of a leaf, or a bone or a shell.
As you can see, for 2 people with Down syndrome having babies, the chances are as follows: -25% chance their child will be typical (no Down syndrome). -50% chance their baby will have Down syndrome. -25% chance there will be no viable pregnancy.
1 One in every 691 babies in the United States is born with Down syndrome. 2  There are more than 400,000 people living with Down syndrome in the United States. 3  Down syndrome occurs in people of all races and economic levels. 4  The incidence of births of children with Down syndrome increases with the age of the mother.