Related Experiment Video
Updated: Jul 10, 2026

Determining the Egg Fertilization Rate of Bemisia tabaci Using a Cytogenetic Technique
Published on: April 1, 2019
Sex ratio, sex change, and natural selection
Abstract:
We describe the analogy between the theory of natural selection on sex ratio in newborn gonochores (which will not change sex), and on the age of sex change in sequential hermaphrodites (which are all born into one sex and change to the other later on). We also discuss the conditions under which natural selection favors sequential hermaphrodites over gonochores and vice versa. We show that, in a nearly stable population of nearly constant age composition, selection favors a rare mutant if it increases the prospective reproduction of its newborn bearers that are (or while they are) members of one sex by a percentage exceeding the percentage loss to the other sex.
Related Concept Videos
Mate Choice
What is Natural Selection?
Types of Selection
Limits to Natural Selection
The Ratio of X Chromosome to Autosomes
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...
Natural Selection and Mating Preferences
Females, due to their biological roles in conception, pregnancy, and nursing, inherently...

