Two species interbreed, and the resulting hybrids fail to complete development; this describes

Two species interbreed, and the resulting hybrids fail to complete development; this describes

• A. Reduced Hybrid Viability
• B. Phylogeny
• C. Hybrid Breakdown
• D. Reduced Hybrid Fertility

Answer: (A)

When two species mate but the hybrids fail to complete development, the issue is that the offspring don’t survive to become healthy, reproductive adults. That is a postzygotic barrier focused on viability—the hybrids’ ability to live and reach maturity is reduced. This exact pattern is described as reduced hybrid viability. Other possibilities cover different outcomes: reduced hybrid fertility means hybrids survive but are sterile; hybrid breakdown refers to hybrids that are viable and fertile in the first generation but show problems in subsequent generations; and phylogeny is about the evolutionary relationships among species, not a reproductive barrier.

When two species mate but the hybrids fail to complete development, the issue is that the offspring don’t survive to become healthy, reproductive adults. That is a postzygotic barrier focused on viability—the hybrids’ ability to live and reach maturity is reduced. This exact pattern is described as reduced hybrid viability.

Other possibilities cover different outcomes: reduced hybrid fertility means hybrids survive but are sterile; hybrid breakdown refers to hybrids that are viable and fertile in the first generation but show problems in subsequent generations; and phylogeny is about the evolutionary relationships among species, not a reproductive barrier.