Intentionally the myrtle warbler and Audubon’s warbler were consider two different species. These birds have not been reclassified as eastern and western forms of a single species. Which of the following pieces of evidence would warrant this reclassification?

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

the answer would be 2, if crossing over doesn’t occur 2 out of 4 of the daughter cells will have that allele.

hope this : )