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.
Most people have 46 chromosomes in each cell. Children with Down syndrome have 47 chromosomes. They have an extra copy of chromosome 21. Normally, we inherit 23 chromosomes from our mother and 23 chromosomes from our father (for a total of 46).