All three statements are correct as they reflect current advancements in genetic engineering and biotechnology. Genetic changes in germline cells (statement 1) allow for heritable modifications in offspring, which can be applied in prospective parents’ reproductive cells. Editing a genome before birth at the embryonic stage (statement 2) utilizes techniques like CRISPR-Cas9 to correct genetic disorders. Furthermore, injecting human induced pluripotent stem cells into pig embryos (statement 3) illustrates the use of cross-species cellular reprogramming for potential organ transplantation and disease modeling, demonstrating the broad applications of stem cell technology. These advancements underscore significant ethical and scientific discussions relevant in modern genetics, making them significant topics for UPSC examination.