First, the zygote becomes a solid ball of cells. Then it becomes a hollow ball of cells called a blastocyst. Inside the uterus, the blastocyst implants in the wall of the uterus, where it develops into an embryo attached to a placenta and surrounded by fluid-filled membranes.
The egg travels from the ovary to the fallopian tube, and there it will stay until it is successfully fertilized by a single sperm. After successful fertilization, the sperm and egg grow into an embryo. The process of becoming an embryo is fast: every 12-14 hours the embryo divides.
A child's biological sex (male or female) is determined by the chromosome that the male parent contributes. Males have XY sex chromosomes while females have XX sex chromosomes; the male can contribute the X or Y chromosome, while the female must contribute one of their X chromosomes.
When a woman is pregnant, she does not continue to ovulate and will not have a period. Menstruation only occurs when a person is not pregnant. Although it is possible for women to experience some bleeding during pregnancy, this will not be due to their menstrual cycle.
Your uterus grows and stretches like a balloon to accommodate your growing baby. It contracts during labor and delivery to help push your baby out of your vagina. After about six weeks, your uterus returns to its pre-pregnancy size (although, it can be slightly larger and show signs of being stretched).

2 comments

Comments (2)

indu marath

Sep 07

What changes occur in the egg cell membrane after fertilization?
Explain the stages of early embryonic development from zygote to blastocyst.
What is the role of the cytoplasm in the egg cell during early development?
How does the embryo implant into the uterine lining?
What are the functions of the placenta during pregnancy?

ridha issak

Sep 09

Replying to

Egg Cell Membrane Changes: After fertilization, the egg cell membrane undergoes changes to prevent other sperm from entering. This is known as the cortical reaction, which makes the membrane impermeable to additional sperm.

Early Embryonic Development Stages:

Zygote: Fertilized egg with a full set of chromosomes.

Blastomeres: Cells resulting from the first divisions of the zygote.

Morula: A solid ball of cells formed from multiple divisions.

Blastocyst: A structure with a fluid-filled cavity, consisting of an inner cell mass (which will become the embryo) and an outer layer (which will form the placenta).

Role of Cytoplasm: The cytoplasm in the egg cell contains nutrients and molecules essential for the early stages of development, supporting cell division and differentiation.

Embryo Implantation: The blastocyst embeds itself into the uterine lining by attaching to and burrowing into the endometrium, where it forms a connection with the maternal blood supply.

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