When undergoing IVF, it is not legally permissible to select embryos with a specific chromosome, but it is possible to select embryos that do not carry a disease-causing gene chromosome if the embryos have the potential for a hereditary disease. During IVF, modern technology can screen the chromosomes of an embryo to see if it carries a certain disease-causing gene, and if the couple has a hereditary disease, it is possible to select an embryo that does not carry the disease-causing gene chromosome for embryo transfer. However, if the couple does not suffer from a hereditary disease, it is not legally allowed to select embryos with a specific chromosome. Therefore, if the couple has a gene for a certain sex-linked disease and there is a medical indication for choosing an embryo chromosome, they can choose an embryo without the disease-causing gene. However, if there is no such medical indication and a sex-specific fetus is merely desired, IVF technology does not allow embryo selection. If IVF is needed in a clinical setting, it is recommended to visit a hospital in time and under the guidance of a doctor.