Although a fetus gets its genes from a sperm and an ovum, and the uterus of the surrogate mother only provides the "environment" in which it develops, Wang Tso-jen, director of the Division of Clinical Genetics at NTU College of Medicine, points out that genes are greatly affected by their environment, especially during the first three months of pregnancy.
雖然胎兒的基因來自精、卵，代母的子宮只是個孕育「環境」，但台大遺傳科主任王作仁指出，基因深受環境影響，特別是孕期的前三個月影響最大。