Question

Test tube baby means a baby born when

• A. It is developed in a test tube
• B. It is developed through tissue culture method
• C. The ovum is fertilized externally and thereafter implanted in the uterus
• D. It develops from a non-fertilized uterus

Answer 1

Answer: (C)

The ovum is fertilized externally and thereafter implanted in the uterus

Answer 2

By in vitro fertilization, the ovum is fertilized with sperm outside the body of a woman, providing the ovum with the same environmental conditions as it would have got inside the uterus. The zygote is grown inside a culture and when embryo is formed, it is then implanted into uterus where it develops into foetus and then into a child. This is called test tube baby Methodology involves the following steps : - Removal of unfertilised ovum from reproductive tract of a female. - Ovum is kept under aseptic conditions. - Fusion of sperm and ovum in a culture medium, outside the female body to form the zygote. - Zygote is stimulated to develop in vitro upto 32-celled stage. - Developing embryo is implanted on the endometrium of the uterus at 32-celled stage. So the pregnancy in the woman starts and further the development of the child continues in the womb till it is bom.