Suppose a 30-year-old man was found to be a suitable donor for a kidney transplant to his younger sister. This transplant would be an example of a(an)

Suppose a 30-year-old man was found to be a suitable donor for a kidney transplant to his younger sister. This transplant would be an example of a(an)

• A. autograft
• B. allograft
• C. isograft
• D. xenograft

Answer: (B)

Transplant types are defined by the donor–recipient relationship and species. A kidney donated from one person to another of the same species but who is not genetically identical is an allograft. Here, the donor is a man and the recipient is his sister—two different individuals of the same species—so the graft fits the allograft category. An autograft would be tissue moved within the same person, an isograft would be between identical twins, and a xenograft would be from another species.

Transplant types are defined by the donor–recipient relationship and species. A kidney donated from one person to another of the same species but who is not genetically identical is an allograft. Here, the donor is a man and the recipient is his sister—two different individuals of the same species—so the graft fits the allograft category. An autograft would be tissue moved within the same person, an isograft would be between identical twins, and a xenograft would be from another species.