The Western honey bee, Apis mellifera, is a semi-domesticated organism. As such, it can be modified by humans using the various breeding techniques developed for plants (corn, wheat, etc.) and vertebrate species (cows, sheep, etc.). What kind of characteristics are bee breeders interested in when it comes to developing honey bee stocks that harbor improved abilities to fend off attacks by Varroa mites?

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BlackTom AI · Accepted Answer

To approach this question, we first consider what breeders aim for when enhancing honey bees’ resistance to Varroa mites, which involves traits that help detect and mitigate mite presence.
Option 1: 'bees that detect infected cells, then uncap them, and eat/discard the infected brood' describes a hygienic behavior known as Varroa-sensitive hygiene (VSH). Bees that can sense brood infested with mites and then uncap and remove or destroy that brood directly reduce mite reproduction and spread. This is a well-documented and effective resistance mechanism used in breeding programs.
Option 3: 'bees that chew the legs of adult mites they encounter' refers to a physical or mechanical form of defense. If bees can damage or disrupt mites by gnawing on them, this would lower mite survival and reproduction, contributing to colony resistance. While less commonly highlighted than hygienic behaviors, it is conceptually plausible as a trait breeders might select for, provided there is heritable variation and a measurable impact on mite loads.
Option 2: 'all answers provided are correct' would be true if both of the above strategies (VSH-like brood hygiene and mechanical mite damage) are indeed realistic, selectable traits with demonstrable heritability and effectiveness in reducing Varroa pressure in breeding programs.
When evaluating the plausibility of each option, it helps to connect them to the broader concept of selecting for traits that improve colony-level resistance rather than just individual bee performance. Hygienic behavior has a strong empirical basis and has been successfully used in breeding programs. The idea of bees actively biting or chewing mites is less widely documented in formal breeding literature, but it remains within the realm of potential resistance strategies if supported by data.
In terms of possible misconceptions, choosing only option 1 would neglect other complementary resistance mechanisms breeders might pursue. Choosing only option 3 would emphasize a mechanism that could be harder to quantify and select for without clear heritability data. Selecting option 2 hinges on the assumption that both 1 and 3 are valid, heritable, and practically achievable through standard breeding approaches, which is consistent with a comprehensive breeding strategy that targets multiple defense traits.
Overall, the framing of this question aligns with the idea that a suite of resistance traits can be pursued, and if both specific hygienic brood-capping/removal and mite-directed mechanical defenses are viable, then declaring that all provided options are correct would be consistent with a multi-trait breeding objective.

ENTOM2030/ENTOM2031 Pre-lecture 22 quiz

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