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Eggs can be categorized into four types based on the quantity of yolk they contain:

1. Aleithal Egg: Contains negligible yolk, as seen in most mammals such as humans.
2. Microlecithal Egg: Contains a very small quantity of yolk, for example, Branchiostoma.
3. Mesolecithal Egg: Contains a moderate amount of yolk, like in frog eggs.
4. Macrolecithal Egg: Contains a large amount of yolk, found in reptiles, birds, and monotremes.

Correct answer: Aleithal Egg: Contains negligible yolk, as seen in most mammals such as humans.

Solution

Aleithal eggs are defined by having negligible or virtually no yolk, which fits mammals like humans. The other categories describe increasing yolk amounts: microlecithal, mesolecithal, and macrolecithal.

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