HORTICULTURE

Detailed explanation-1: -Researchers have observed some adverse health effects in sheep and other mammals that have been cloned. These include an increase in birth size and a variety of defects in vital organs, such as the liver, brain and heart.

Detailed explanation-2: -Mostly losses in cloned animals are due to placental abnormalities, cardiovascular and respiratory problems. These anomalies are most likely due to incorrect epigenetic reprogramming of the donor genome, leading to inappropriate patterns of gene expression during the development of clone.

Detailed explanation-3: -What prevents scientists from cloning humans despite the fact that other mammals such as sheep have been cloned? Cloning humans would take too much time to reproduce. There are many ethical problems involved in cloning humans. The technology to clone humans has not been explored.

Detailed explanation-4: -Only a tiny percentage of cloning attempts have successful births and very few offspring are healthy. They can suffer and die from respiratory distress, low-blood sugar, weak immune systems, deformities and many other problems.