According to findings from a mate choice experiment discussed in the Week 1 Lecture "Different Strokes...", female rats show a decreased preference for ________________.

Question

BlackTom AI · Accepted Answer

Female rats avoid males descended from ancestors exposed to DNA‑damaging chemical agents because mate choice favors signals of genetic and epigenetic integrity.

1) Relevant knowledge points and concepts
- Sexual selection and mate choice: females prefer mates that signal higher genetic quality to maximize offspring fitness.  
- Transgenerational effects/epigenetics: ancestral exposure to mutagens can alter gene expression or cause heritable epigenetic changes that affect descendant phenotype (behavior, scent, health).  
- Olfactory and behavioral cues: rodents use scent and subtle behaviors to assess mate quality; changes in these cues can drive preference changes.

2) Step‑by‑step reasoning from the experiment to the conclusion
- Experimental design (typical mate‑choice paradigm): a female is presented with two or more males differing in a single manipulated attribute. Time spent investigating or mating attempts indicate preference.  
- In the lecture’s described experiment, the manipulated attribute was ancestral exposure: one male lineage had great‑grandmothers exposed to a DNA‑damaging chemical, the other did not.  
- Observed outcome: females spent less time with, investigated less, or showed fewer mating behaviors toward males from the exposed lineage, indicating decreased preference.

3) Intermediate logical steps (no numerical calculations)
- Ancestral exposure → heritable molecular/phenotypic changes in descendants (e.g., altered odor cues or reduced vigor).  
- Altered cues detected by females → perceived lower genetic/epigenetic quality → avoidance in mate choice.  
- Avoidance reduces the chance of passing on potentially compromised genetic/epigenetic material.

4) Why the correct answer is correct
- The answer (males whose great‑grandmothers had been exposed to a chemical that causes DNA damage) directly matches the experimental manipulation and observed female behavior: a transgenerational effect caused decreased female preference.

5) Why the other options are incorrect
- a. Subdominant males: dominance status can influence choice, but this option was not the specific finding described.  
- b. Males with visible signs of illness: obvious illness typically reduces preference, but the lecture highlighted subtler, ancestral exposure effects instead.  
- c. Males who smelled of citral: citral is a scent compound; there was no finding that citral specifically reduced female preference in the lecture’s example.

Conclusion: The experimental findings indicate decreased female preference for males whose great‑grandmothers had been exposed to a DNA‑damaging chemical, confirming answer d.

According to findings from a mate choice experiment discussed in the Week 1 Lecture "Different Strokes...", female rats show a decreased preference for ________________.单项选择题

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