Question 43

The initial cell that contains the genetic information of both parents is the zygote.

The zygote is the first cell formed when a sperm cell fertilizes an egg cell, combining the genetic material from both parents into a single cellular structure.

A) Embryo

The embryo refers to the developing organism after the zygote stage, specifically from implantation until the end of the eighth week of development. While it contains genetic information from both parents, it is not the initial cell where this genetic information is combined.

B) Trophoblast

The trophoblast is a layer of cells that forms the outer shell of the blastocyst, playing a crucial role in implantation and the formation of the placenta. However, it does not contain the combined genetic information of both parents, as it arises from the zygote.

C) Blastocyst

The blastocyst is a structure formed in the early development of mammals that contains a fluid-filled cavity and differentiates into two cell types: the inner cell mass and the trophoblast. Although it contains genetic information from both parents, it is formed after the zygote stage and is not the initial cell.

D) Zygote

The zygote is the correct answer as it is the initial cell resulting from the fertilization of an egg by a sperm. It contains the complete set of genetic material from both parents, making it the first stage in the development of a new organism.

Conclusion

The zygote is definitively the correct answer, as it represents the very first cell that integrates genetic information from both parents. Other options, such as the embryo, trophoblast, and blastocyst, represent subsequent stages of development that occur after the zygote has formed and cannot be considered the initial cell containing parental genetic information.