Question

why is egg considered as a single cell​

Answer 1

Answer:

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The rest of the egg only serves to feed or protect the embryo after fertilization. However, in some animals the yolk is incorporated into the cytoplasm of the ovum, and so the entire yolk could be considered the "egg". ... An egg/ ovum is a single haploid cell which has a single set of Chromosomes.

Answer 2

HERE IS YOUR ANSWER

However, in some animals the yolk is incorporated into the cytoplasm of the ovum, and so the entire yolk could be considered the "egg". ... An egg/ ovum is a single haploid cell which has a single set of Chromosomes. It will fuse with the sperm cell to form a diploid cell called zygote.