"Every" in both examples isn't functioning as a logical operator because it is an adjective describing female gametes. In this case, "every" or all female gametes. In the first example, you are left with this: GM —> CEFG

While "All" leads you to put Genetic Material on the sufficient side of your conditional statement, it can also be seen as an adjective describing "genetic material." In that case, "Is" becomes the logical operator and you are left with the same translation: GM —> CEFG

In other words, if there is Genetic Material, there is a Contribution from Every Female Gamete.

The same holds for the second example: "Genetic material is contributed by every female gamete."

Without "all" you are just left with "Genetic Material." And the logical operator is "is." It translates like this: GM —> CEFG

Another way to think about it is that, according to either sentence, in order for Genetic Material to exist, there must be a contribution from every female gamete. Furthermore, if there is a contribution to Genetic Material, it came from Every Female Gamete. The contribution from every female gamete is necessary and so, belongs on the necessary side of a conditional diagram.

On the other hand, Female Gametes can exist without contributing to genetic material. The contribution is not necessary for "every female gamete." This sentence only makes the contribution necessary for the Genetic Material (Of course, I have no idea if that actually holds scientifically. I'm basing this off the sentence alone, whether it's a true statement or not.)

Hope that helps.

JY explains "is" and other "miscellaneous" indicators in detail in the lesson on "Miscellaneous Logical Indicators."