Question

In the production of test-tube babies
(a) Fertilization is internal and fetus formation is external.
(b) Fertilization is external and fetus formation is internal.
(c) Fertilization and fetus formation are external.
(d) Fertilization and fetus formation is internal.

Answer 1

In the production of a test-tube baby, the male and female gametes are fused outside the human body in the laboratories, and then the zygote is transferred to the woman's body.

Complete answer:
In the production of test-tube babies, Fertilization is external and fetus formation is internal. The test-tube baby is the result of a human gametes mating that results from methods that are beyond sexual activity between a male and a female and instead utilize medical intervention that manipulates both the egg and sperm cells for successful fertilization outside the body.

Additional Information: The woman takes fertility drugs, which stimulate the development of extra oocytes in the ovaries of the female body. This takes place over a number of days. At this time, the mature eggs are removed from the ovaries with an ultrasound-guided needle.
In the lab, the retrieved eggs are combined with male gamete i.e sperm. The egg and sperm are put together in a petri dish, where hopefully a sperm cell will fertilize an egg cell. When the human egg cell is fertilized, it is now known as an embryo. The resulting embryo then develops for a few more days in the laboratory. Now the healthiest embryos are transferred to the intended mother’s uterus.
So, the correct answer is ‘(b) Fertilization is external and fetus formation is internal’.

Note: It is interesting to note that Louise Brown was born at Oldham General Hospital forty years ago on 25 July 1978 and made history by being the first test-tube baby conceived through IVF.