The answer is: They will not continue with pregnancy, if baby is born they rarely survive beyond early childhood.
Most of the zygote with serious chromosomal problem will be dead before labor. A big genetic problem will cause the baby unable to survive. Most of the abortion at the first trimester pregnancy is happen because of the chromosomal problem. If the baby survive till labor they will still have some health problems and most will not survive long.
Technique b is more advantageous because if they used technique a. The bees that pollinate the crops would die and the crop would not make more seeds. Hope this helps(:
Reduce the number of trips you take in your car. Reduce or eliminate fireplace and wood stove use. Avoid burning leaves, trash, and other materials. Avoid using gas-powered lawn and garden equipment.