Comparing reproductive strategies

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Comparing reproductive strategies

Asexual reproduction can produce offspring quickly without requiring another individual for fertilization. Genetically similar offspring can retain a useful combination of traits, but their similarity may leave a population vulnerable to the same environmental change.

A stable favorable environment and a changing environment pose different challenges. Producing many matching plants can be useful in agriculture, while a new pathogen may expose their shared vulnerability. The explanation is conditional: variation is not a guarantee that some offspring survive, and asexual populations can still acquire variation through mutation.

Several organisms can use both strategies. Strawberry plants make runners and also reproduce through seeds; fungi can have sexual and asexual phases. The malaria parasite has different reproductive phases in its human and mosquito hosts. The question is not simply which route is faster: consider whether a mate is needed, the energy cost, offspring numbers and how inherited variation affects survival after an environmental change.

Worked example: Why could a genetically uniform crop be vulnerable to a new pathogen?

Individuals share similar inherited features

A susceptibility could be shared across the crop

Answer: Limited variation may leave few resistant plants.

Check your understanding: Does variation guarantee that every sexual offspring survives?

Answer: No.

Why: Variation provides different possibilities; survival depends on the environment and the particular traits.