Question

in the mid - 1990s, a sheep (dolly) was successfully cloned using somatic cell nuclear transfer. in this technique,
multiple choice
an egg nucleus was transferred into a body cell, and the body cell developed into a sheep
sperm and egg were artificially combined in a test tube
radioactive isotopes were used to change the behavior of a body cell
the chromosomes of a body nucleus were made haploid and used to fertilize an egg

Explanation:

Somatic cell nuclear transfer involves transferring the nucleus of a somatic (body) cell into an enucleated egg cell. The first option describes transferring an egg nucleus into a body cell, which is incorrect. The second option is in vitro fertilization. The third option is not related to somatic cell nuclear transfer. The fourth option is incorrect as somatic cell nuclei are diploid, not haploid.

Answer:

None of the options provided are correct. The correct process is transferring the nucleus of a somatic cell into an enucleated egg cell.