Jacqui Comstock, an oceanographer on Cape Cod, is the product of both. Comstock’s story goes back to 1994, a decade after the first baby conceived using a donor egg was born. (Jesse Costa/WBUR)When her daughter first made contact with McColl, Ruth Comstock admits she felt threatened. She calls Ruth Comstock her mother, and McColl her egg donor, which is fine with McColl. Pam McColl, left, and Jacqui Comstock laugh during a conversation with Jacqui’s mother, Ruth Comstock, about their meeting for the first time.