are more chromosomal abnormalities found in live births or spontaneous abortions, why?

Answer 1

Spontaneous abortion is the interruption of pregnancy before the 24th week. Most abortions, approximately 75%, happen before the 16th week and they are detected at 12% of pregnancies.
Studies have shown that at 50% of abortions the embryos have some kind of chromosome aberration, with the trisomies being the most often. It's obvious that a spontaneous abortion acts as a "defensive mechanism", which averts the birth of a child with serious chromosome aberrations.

Answer 2

I think there are more spontaneous abortions, because Nature tries to take care of mistakes in chromosomal abnormalities by allowing this to happen. I was always told that if I was healthy, doing the right 'things', eating the right foods, and did have a miscarriage in the first 3 or 4 months of a pregnancy, that I should consider it Nature's way of correcting an error. When I was pregnant with conjoined twins, one was lost early in pregnancy, while one son survived and is just fine NOW, but, he WAS a great big bag of parts from God that needed to be operated on, a lot! He's a great fellow! I was lucky!

Answer 3

spontaneous abortions.
The vast majority of significant chromosomal abnormalities are fatal mutations. For example, in polyploidy disorders (extra or not enough chromosomes) only 5 of chromosomes can be duplicated and result in live birth (and still sometimes have spontaneous abortions-21, 18, 13, X, Y*) and only one (lack of one X or a Y, resulting in an XO**) can survive deletion

*Rarely, 8 and 9 can be duplicated and result in a live birth, but the quality and length of life of people with these forms of trisomy are VERY. VERY, VERY severely impacted. 18 and 13, while occassionally producing children that live a long time, still regularly result in spontaneous abortion and often stillborn children or those that die after a short time. 21 causes down syndrome)
**Turner Syndrome