Differences of bird songs between two closely related species of meadowlarks represent a mechanism for

Question

BlackTom AI · Accepted Answer

The question asks about what differences in bird songs between two closely related meadowlark species illustrate as a mechanism.
Option 1: 'speciation by polyploidy.' Polyploidy is a sudden chromosome number change more common in plants and rare in birds; it is not tied to differences in song patterns, so this is an unlikely mechanism here.
Option 2: 'geographic isolation.' Geographic isolation refers to physical separation between populations. While it can contribute to speciation, differences in birdsong point to behavioral barriers within the same area rather than a geographic barrier, making this option less fitting for this scenario.
Option 3: 'postzygotic isolation.' Postzygotic isolation involves reduced fitness of hybrids after mating has occurred (e.g., sterile or nonviable offspring). Song differences operate before mating happens, so they are not describing postzygotic barriers.
Option 4: 'prezygotic isolation.' Differences in song can prevent interbreeding by influencing mate choice before fertilization, which is a classic example of prezygotic isolation. Against a backdrop of closely related species, such behavioral cues are a primary mechanism to maintain species boundaries.

Differences of bird songs between two closely related species of meadowlarks represent a mechanism for单项选择题

类似问题

Crosses between female horses and male donkeys produce mules. Gene flow between the gene pools of horses and donkeys is prevented by I. hybrid sterility. II. a pre-zygotic isolating mechanism. III. a post-zygotic isolating mechanism.

Two species of a plant cannot interbreed, because their flowers differ in size and shape and require pollination by different species of bee. This is a/an ___ isolating mechanism.

Two species of a plant cannot interbreed, because their flowers differ in size and shape and require pollination by different species of bee. This is a/an ___ reproductive barrier.

Prezygotic isolating mechanisms are typically more common than postzygotic mechanisms. One explanation is that prezygotic mechanisms are less costly in terms of and , and so natural selection has favored them.

Although they both prevent successful interbreeding among members of different species, isolating mechanisms prevent the formation of a zygote, whereas isolating mechanisms prevent successful reproduction of a hybrid after successful fertilization has occurred.

Reproductive isolating mechanisms fall into two main categories: isolating mechanisms and isolating mechanisms.

In some cases, species are defined by the ability of members to interbreed or the extent of isolation.

Mechanisms that prevent genetic exchange between members of different species and often play a role in plant and animal speciation are termed reproductive mechanisms.

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