Usage of 卵 vs. 玉子 when talking about eggs


While reading the first manga of 「3月のライオン」, I came across an interesting usage
of kanji for eggs. Until then, I've only seen 卵 used for eggs, or its readings
using hiragana or katakana. The protagonist of the story received a text
message on his phone, that asked him to drop-by the convenience story on the
way to the sender's home, in order to buy some groceries. 「あと、 **玉子** も！！」was
at the end of it.

I'm wondering why these kanji were used and if there are general guidelines
when to use one or the other.




The short of it is that 卵 is used for the general concept of eggs (usually in
a scientific context) ー like animals laying eggs ([産卵]{さん・らん}), an ovum
([卵子]{らん・し}), an ovary ([卵巣]{らん・そう}), ovulation ([排卵]{はい・らん}), etc.

玉子 is used to talk about eggs in the context of food/eating. That is why 玉子
was used by the character when speaking of groceries to purchase.

