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.
Her risk of a baby with Down Syndrome is about 1 in 365. In other words, the odds of having an absolutely normal baby would be about 99.34 percent. I haven't answered the question of how old is too old because I don't think there is one answer.