There are not technically "3 types" of reproductive cloning, but rather two main methods used to achieve the same goal: creating a genetically identical copy of an existing organism.

Here's a breakdown of the two methods:

1. Somatic Cell Nuclear Transfer (SCNT)

* This is the most common method and is how Dolly the sheep was cloned.

* It involves taking a somatic cell (any cell from the body, not a sperm or egg cell) from the organism you want to clone and transferring its nucleus (containing the DNA) into an enucleated egg cell (an egg cell with its own nucleus removed).

* This egg cell, now containing the DNA of the donor organism, is then stimulated to develop into an embryo. The embryo is then implanted into a surrogate mother, and if successful, will develop into a clone of the original organism.

2. Artificial Embryo Twinning

* This method is a more natural approach, mimicking the process of identical twin development.

* It involves splitting a very early embryo into two or more identical embryos.

* This is done by physically dividing the embryo into smaller sections, each containing the same genetic material.

* These individual embryos can then be implanted into surrogate mothers, resulting in multiple identical offspring.

While these are the primary methods, it's important to note that Reproductive Cloning is a very complex and inefficient process.

There are other, less common or experimental techniques, but these are the two primary methods currently used.