Fertile tetraploids seem to have arisen by chromosome duplication in a hybrid that was produced by a cross of:
A) Two different, but related, diploid species
B) Two identical diploid species
C) Four different bur related haploid species
D) Four identical diploid species
E) Four identical haploid species

Question

Quizplus · Accepted Answer

Fertile tetraploids can arise from a hybrid of two different but related diploid species, which can result in the doubling of chromosome number. This hybrid can then reproduce asexually, producing a fertile tetraploid population.

Fertile Tetraploids Seem to Have Arisen by Chromosome Duplication in a Hybrid