Question

In human females, the fertilized eggs get implanted in the uterus after
A. Two months of fertilization
B. One month of fertilization
C. Three weeks of fertilization
D. Eight days of fertilization

Answer 1

Hint: After the fertilization has occurred the zygote undergoes into rapid differentiation of cells and during this It travels to the vagina transforming into embryo and getting implanted to the walls of vagina

Complete answer:
The fertilization is a process where the sperms and the ovum get fused together to form the zygote. The fusion of male and female gametes takes place inside the fallopian tube of the female reproductive organ. After this the zygote has to go under differentiation where the polar bodies fuse together and the division of its stars to occur. Zygote undergoes rapid mitosis from two celled stage followed by four celled, then eight, the sixteen and eventually it stops at thirty-two celled stage known as blastocyst and during this transformation the zygote had become an embryo and travelled from fallopian tube to the vagina. This movement generally occurs within 6-10 days and after the fusion the embryo has to be implanted into the walls of vagina quickly. If we take an idea then by the end of the second week the process of implantation of the embryo into the uterus wall is completed in every female and it does not take longer than this. Now as soon as the implantation has occurred the embryo is responsible for the release of pregnancy hormone or hcg which gives signal to the body to prepare for the pregnancy.
After this the implanted embryo will also undergo differentiation and by the end of the first month most of the layers of embryo will develop and it will then begin to get modified and transformed into various organs. The inner layer is responsible for the development of organs and the outer layer is responsible for the formation of skin. The embryo will go on dividing its cell in further months till the baby is developed.

Hence, the correct answer is option (D).

Additional information:
The chances of fusion of male and female are very less as all the conditions of time, place should be met and this is not in anyone’s hand it is entirely based on the chances. Even if the fusion has occurred then there are around 60%chances in which the implantation is not successful.

Note: The zygote tends to perform the process of differentiation and then travel to the uterus. Since the travelling to the uterus is a time consuming process but is essential for the occurrence of successful fertilization.