In contrast to homoploid hybrid species,polyploid species are easily diagnosed because of chromosome number changes associated with genome doubling.

与同杂合比，因为与基因组加关的染色数目的变化,杂合很容易判断。

Scientists had theorized that homoploid hybrids would be more likely to form when the new species was adapted to life in an extreme environment.

科学家们有理论说同血是在极端环境下新品更加适应生存需求时出现的。