When the ranges of two different species meet, a stable 'hybrid zone' occupied by hybrid individuals may form. How is this possible?
a. Two diverged populations are capable of mating and producing viable and fertile offspring.
b. Hybrid individuals are always allopolyploid and are thus unable to mate with either of the original species.
c. Hybrid individuals may have reduced fitness and thus be strongly selected against.
d. One species has a selective advantage, so as hybridization continues, the other species will go extinct.

검증된 단계별 안내

Understand the concept of a hybrid zone: A hybrid zone is a region where two different species meet and interbreed, producing hybrid offspring. This occurs when the ranges of the two species overlap.

Consider option a: Two diverged populations are capable of mating and producing viable and fertile offspring. This suggests that the hybrid individuals are able to survive and reproduce, maintaining the hybrid zone.

Evaluate option b: Hybrid individuals are always allopolyploid and are thus unable to mate with either of the original species. Allopolyploidy refers to having multiple sets of chromosomes from different species, which can affect the ability to reproduce with parent species.

Analyze option c: Hybrid individuals may have reduced fitness and thus be strongly selected against. Reduced fitness means hybrids might not survive or reproduce as well as purebred individuals, potentially limiting the hybrid zone.

Consider option d: One species has a selective advantage, so as hybridization continues, the other species will go extinct. This implies that hybridization could lead to the dominance of one species over the other, affecting the stability of the hybrid zone.

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Hybrid Zone

A hybrid zone is a geographic area where two distinct species meet and interbreed, producing hybrid offspring. These zones are often stable and can persist over time if the hybrids have some level of fitness that allows them to survive and reproduce. The stability of a hybrid zone depends on various factors, including the relative fitness of the hybrids compared to the parent species.

Hybrid Fitness

Hybrid fitness refers to the ability of hybrid individuals to survive and reproduce in their environment. In a hybrid zone, hybrids may have reduced fitness compared to their parent species, which can lead to strong selection against them. However, if hybrids possess certain advantageous traits, they may thrive, contributing to the stability of the hybrid zone.

Allopolyploidy

Allopolyploidy is a condition in which an organism contains two or more sets of chromosomes derived from different species. This can occur in hybrids, making them unable to mate with either parent species due to differences in chromosome number. While allopolyploid hybrids are often sterile, they can sometimes undergo genetic changes that restore fertility, allowing them to establish as a new species.