Hcg is secreted in the human female immediately after conception. how would a gynecologist use this information? to detect pregnancy
to detect abnormalities in the embryo
to facilitate embryo implantation

It is use to detect pregnancy. The human chorionic gonadotropin (hCG) test is done to check for the hormone hCG in blood or pee. Some hCG tests measure the correct sum. Some simply verify whether the hormone is available. HCG is made by the placenta amid pregnancy.

HCG is Human chorionic gonadotropin. it's produced by placenta after implantation. So answer to your question is To detect pregnancy. HCG is a hormone made by the pregnancy that can be detected in the mother's blood or urine even before the woman's missed period.

Crossing over creates new combinations of genes in the gametes that are not found in either parent contributing to genetic diversity