Question

In cloning of cattle the fertilized egg is taken out of the mother’s womb and:

• A. In the eight-cell stage, cells are separated and cultured until small embryos are formed which are implanted into the womb of other cows.
• B. In the eight-cell stage the individual cells are separated under electrical field for further development in culture media.
• C. From this upto eight identical twins can be produced.
• D. The egg is divided into 4 pairs of cells which are implanted into the womb of other cows.

Answer 1

The correct option is B In the eight-cell stage the individual cells are separated under electrical field for further development in culture media.

In cloning of cattle, the fertilized egg divides in 2, then in 4 and then in 8. This embryo is carefully removed from the womb. The embryonic cells are then separated using an enzyme. Each isolated cell is kept in a nutrient medium and later implanted in the womb of a different cow.