What evidence or logical reasoning suggested that Earth was much more than a few thousand years old?

Omphalos hypothesis

The Omphalos hypothesis is one attempt to reconcile the scientific evidence that the universe is billions of years old with a literal interpretation of the Genesis creation narrative, which implies that the Earth is only a few thousand years old.

Explanation:

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Explanation:

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.