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Related Experiment Video

Updated: Jul 19, 2026

Assessing Differences in Sperm Competitive Ability in Drosophila

Assessing Differences in Sperm Competitive Ability in Drosophila

Published on: August 22, 2013

Sperm-female coevolution in Drosophila.

Gary T Miller¹, Scott Pitnick

¹Department of Biology, Syracuse University, 108 College Place, Syracuse, NY 13244, USA.

Science (New York, N.Y.)

|November 9, 2002

Summary

Male fertilization success depends on sperm and female reproductive tract interactions. Female reproductive tract evolution drives sperm length evolution, favoring longer sperm, similar to peacock tails.

Area of Science:

Evolutionary biology
Reproductive biology
Sexual selection

Background:

Sexual selection drives rapid evolution of reproductive traits through inter-sexual interactions.
The specific selective pressures shaping interacting sex-specific phenotypes remain largely unknown.

Purpose of the Study:

To investigate the evolutionary dynamics of interacting sperm and female reproductive tract morphology.
To determine the role of female morphology in driving sperm length evolution.

Main Methods:

Experimental evolution using Drosophila melanogaster populations selected for divergent sperm length and female sperm-storage organ length.
Analysis of male fertilization success based on the interaction between sperm and female morphology.

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Measuring and Altering Mating Drive in Male Drosophila melanogaster

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Last Updated: Jul 19, 2026

Assessing Differences in Sperm Competitive Ability in Drosophila

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Published on: September 11, 2014

Measuring and Altering Mating Drive in Male Drosophila melanogaster

Measuring and Altering Mating Drive in Male Drosophila melanogaster

Published on: February 15, 2017

Main Results:

Male fertilization success is contingent upon the interplay between sperm and female reproductive tract morphology.
Sperm length evolved as a correlated response to selection imposed by the female reproductive tract.
Female reproductive tract evolution was shown to selectively favor males with longer sperm.

Conclusions:

Interactions between male and female reproductive traits are crucial drivers of evolution.
Female reproductive tract morphology plays a significant role in shaping male reproductive trait evolution, analogous to sexual ornaments.
This study provides experimental evidence for coevolutionary processes in reproductive trait evolution.