性二态与性别间的关系:模型是否支持直觉?
Gemma Puixeu1, Laura Katherine Hayward1
1Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria.
Genetics
|August 21, 2025
概括
这项研究揭示了基因相关性与性二态性之间的关系并不总是负面的. 模型表明,根据选择压力,共享的遗传结构可以增加或减少两性之间的特征差异.
科学领域:
- 进化遗传学
- 定量遗传学
- 性选择
背景情况:
- 性二态 (SD) 是男性和女性之间的平均特征值的差异.
- 通常认为SD受共同遗传结构的约束,导致与性别间遗传相关性 (r fm) 的负相关性.
- 现有的理论表明,SD和r fm因性别特异性选择或选择减少r fm的限制而存在负相关性.
研究的目的:
- 调查跨性别遗传相关性 (r fm) 和性二态性 (SD) 之间的关系.
- 探索r fm和SD之间存在相关性的条件.
- 为理解SD和r fm不一致的经验发现提供一个机制框架.
主要方法:
- 结合性别特异性稳定选择,突变和遗传漂移的理论模型的开发.
- 对基因架构与形成性别特征差异的进化力量之间的相互作用进行分析.
- 量化基因漂移对非零SD的影响,即使选择相同.
主要成果:
- 与常见的假设相反,模型表明,被认为产生SD和r fm之间负相关性的机制也可以产生正相关性.
- 这种逆转取决于性别特异性选择的方向,特别是它是否有利于增加或减少二态性.
- 即使选择压力在两性之间相同,遗传漂移也可以产生非零的SD.
结论:
- 跨性别基因相关性与性二态性之间的关系比之前所认为的要复杂得多.
- 提供了一个机制框架来解释影响r fm和SD相关性的条件.
- 这些发现为相互矛盾的经验结果提供了潜在的解释,并强调了基因漂移在产生性二形态的作用.
相关概念视频
The Ratio of X Chromosome to Autosomes
8.8K
In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female...
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female...
8.8K
Natural Selection and Mating Preferences
173
The principle of natural selection posits that organisms better adapted to their environment are more likely to survive and reproduce. This principle is closely intertwined with mating preferences, a key aspect of sexual selection, which evolutionary psychologists believe is driven by instincts to propagate one's genes. Such instincts significantly influence mating behaviors and preferences between genders.
Females, due to their biological roles in conception, pregnancy, and nursing,...
Females, due to their biological roles in conception, pregnancy, and nursing,...
173
Mate Choice
10.4K
Mate choice—the decision about whom to mate with—is a type of natural selection, since animals must reproduce to pass down their genes. Mate choice is also called intersexual selection because the behavior occurs between the sexes.
10.4K
Instinct Theory
547
Instinct theory proposes that innate biological instincts, like animal behavioral patterns, primarily drive human behavior. These instincts are inborn, not learned, and are fundamental to decision-making and action. Just as animals rely on instincts for critical survival functions such as migration, nest building, and defense, humans are also believed to exhibit behaviors rooted in evolutionary needs. For example, the instinct to reproduce motivates sexual behavior, while territorial instincts...
547
Dosage Compensation
6.3K
In animals, gender is determined by the number and type of sex chromosome. For example, human females have two X chromosomes, and males have one X and one Y chromosome, whereas C.elegans with one X chromosome is a male, and the one with two X chromosomes is a hermaphrodite.
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with distinct numbers of X chromosomes will...
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with distinct numbers of X chromosomes will...
6.3K
Criticisms of the Evolutionary Perspective
157
In a study where individuals posing as strangers offered compliments and proposed casual sex to students, the responses differed significantly based on gender. Not a single woman accepted the proposal, while 70% of the men agreed. This outcome provides a useful scenario to explore through the lens of evolutionary psychology and social learning theory, highlighting the diverse perspectives on human sexual behaviors.
Evolutionary psychology provides one explanation for these findings, suggesting...
Evolutionary psychology provides one explanation for these findings, suggesting...
157


