Difficulty: Medium

Average Score: 71%

Which of the following examples best illustrates sexual reproduction?

Rationale

A bee transfers pollen between the flowers of different plants of the same species.

This example exemplifies sexual reproduction as it involves the exchange of genetic material between distinct individuals, leading to fertilization and the production of seeds in flowering plants. The transfer of pollen from one flower to another is a critical step in the sexual reproductive process.

A (A single bacterium increases in size and divides into two bacteria.) YOUR ANSWER

This process describes binary fission, which is a form of asexual reproduction. In this method, one bacterium grows and splits into two identical cells without the exchange of genetic material, thus lacking the genetic diversity characteristic of sexual reproduction.

C (A small bud forms on a yeast cell, slowly grows, and separates from the original cell.) YOUR ANSWER

This scenario illustrates budding, another form of asexual reproduction. The new yeast cell is genetically identical to the parent, as it arises from a part of the original cell without any genetic exchange, thereby not qualifying as sexual reproduction.

D (A flatworm's body fragments into different parts, which all become fully formed adults.) YOUR ANSWER

Fragmentation is a method of asexual reproduction where an organism can regenerate missing parts or create new individuals from pieces of the parent body. While it is an impressive form of reproduction, it does not involve the mixing of genetic material, which is essential for sexual reproduction.

Conclusion

Sexual reproduction is characterized by the combination of genetic material from two distinct organisms, resulting in offspring that possess genetic diversity. The example of a bee transferring pollen between flowers encapsulates this concept, as it highlights the role of external agents in fertilization. In contrast, the other options illustrate various asexual reproduction methods, which do not involve genetic exchange and thus lack the variability that sexual reproduction offers.

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