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.
Down syndrome can be diagnosed before birth. Your physician may be able to recognize some of the distinctive physical characteristics of an infant with Down syndrome during an ultrasound. The diagnosis is confirmed by testing the infant's chromosomes for trisomy 21 or other disorders of the 21st chromosome.he symptoms of fragile X syndrome are caused by abnormalities in DNA on the X chromosome. Usually, the condition is passed down to affected children by their mothers. Many children with the syndrome have normal intelligence.