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A hen's egg can be seen easily. Is it a cell or a group of a cell?
A hen’s egg is an example of a macroscopic cell. A hen’s egg is unicellular until it is fertilized.
Then as the fertilized egg (zygote) begins to divide or grow into an embryo, the single-cell divides multiple times, hence becoming multicellular.
The albumen (the egg white) and the yolk (yellow part of the egg) are the reserve food for the growing embryo till it hatches out in the form of a chick.
Albumen- It is mainly composed of water (about 90%) and protein (remaining 10%) that supports the yolk and provides water and proteins for the growing chick.
Yolk- It is one single, massive cell, thousands of times bigger than typical cells. It contains most of the nutrients in the egg such as a heady mixture of fat (about 26%), carbohydrates (4%) protein (16%), and cholesterol (about 1%).
Note- Sometimes people thought that the yolk itself is the nucleus that contains the DNA, but it’s not. It can’t be seen with the naked eye. It’s a small spot on the surface of the yolk called the germinal disc, that though called a blood spot.
When the egg gets fertilized, the germinal disc is the spot where the chick would begin, as it splits into multiple cells and grows, fed by the nutrients in the yolk.
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