Haven't we answered these in multiple threads already? Ok.. pay attention this time..
1. Yes, I would abort a deformed fetus.. at this stage of my life I'd abort any fetus/ embryo though.
2. See above.
3. See above
4. Know your subject a bit before dramatization for propaganda purposes please. go to
Fetal Abnormalities and go about 2/3 the way down the page; there are many links to lethal chromosonal abnormalities and pictures of fetal victims to show you what you are actually talking about.
Go view those then come back here and we can discuss your question about defects.. in all 4 of its repetitive parts.
One of the more notable aspects of Down syndrome is the wide variety of features and characteristics of people with trisomy 21:( Trisomy 21: Down syndrome; incidence based upon maternal age, though translocation type is familial; features can include: epicanthal folds, simian crease, brachycephaly, cardiac defects)
There is a wide range of mental retardation and developmental delay noted among children with Down syndrome.
Some babies are born with heart defects and others aren't. Some children have associated illnesses such as epilepsy, hypothyroidism or celiac disease, and others don't.
The first possible reason is the difference in the genes that are triplicated. As I mentioned above, genes can come in different alternate forms, called "alleles." The effect of overexpression of genes may depend on which allele is present in the person with trisomy 21. The second reason that might be involved is called "penetrance." If one allele causes a condition to be present in some people but not others, that is called "variable penetrance," and that appears to be what happens with trisomy 21: the alleles don't do the same thing to every person who has it. Both reasons may be why there is such variation in children and adults with Down syndrome.