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Line breeding chickens is much safer than line breeding mammals. However, you don't need to line breed to figure out what genes your rooster has. Just breed him to some white or brown layers and wait to see what color eggs the pullets grow up to lay.

Earlobe color has nothing to do with it. The pea comb gene is located very near the gene for blue eggshells, and they are usually inherited together. However, there are no guarantees.

Nope. The only way to tell if an Easter Egger rooster has the blue eggshell gene is to breed him and grow out his chicks. If all of the pullets lay blue or green eggs, he's got two copies of the gene. If any of her daughters lay a color other than blue or green, he only has one copy of the gene.

She would produce green layers, but only if paired with a rooster that has the blue eggshell gene. The gene for blue shells is dominant over the white shell gene. The blue shell gene, combined with a gene for brown 'coating' produces green eggs. She has no blue egg shell gene to pass on.