The Donor Sibling Registry makes it possible for people who were conceived from donated sperm by artificial insemination to establish contact with their half-siblings-those whose mothers used the same sperm donor. Some donors are much more popular than others; reporter Amy Harmon found that dozens of women bought Donor 150's sperm from the Cali-fornia Cryobank. (See Social Context "Shopping the Sperm Supermarket")

So far the Registry's website has connected more than 1000 half-siblings.The site makes it possible for a donor to shed his anonymity and make contact with his biological offspring. This doesn't happen very often, however.

The half-siblings connected through the site say that it helps them develop a sense of family that is missing. By entering the name of a sperm bank and a donor number on the website, the offspring of a donor n sometimes find a match with others. When this riaPPehs, some of them say, they feel as if they are now loser to filling in the missing half of their family.

About 30,000 children are born each year with do-nated sperm, and the sperm of a single donor may be chosen dozens of times. It is possible that the donor has dozens of children, and it isn't likely that they will know that they had the same biological father. Thus, the possibility that some of the offspring will become involved in incest with a half-sibling is genuine.

Read "Looking for the Family Tree" and answer the 3 questions.

Please substantiate your responses referencing applicable ethical concepts, principles, perspectives and/or theories.

1. Should a sperm donor be required to agree to reveal his identity to his biological children when they turn 18?

2. Mothers have no legal obligation to reveal to their children that they were born by the use of donor sperm. Should this fact be included on a child's birth certificate?

3. Should sperm banks be required to keep a registry of children born by the use of the sperm they supplied? If they did, then children born by AI would be able to find out easily whether they were related, even if they didn't know the number of the donor who provided the sperm used by their mothers.