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Questions tagged [sexual-selection]

The concepts of mate choice and competition over eligible members of the opposite sex in animals, including humans.

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Is male cosmetic surgery a viable mating strategy for choosy females?

Is a man in modern times "competing" with other men based on genetics for reproductive success? If so, would male cosmetic surgery of any degree be viable as a modern attempt at competing for female ...
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Why so ugly people live or have the instinct to survive and reproduce still? [duplicate]

Face it: it may be hard but ugly people -- men especially (since women choose) -- are bound to not naturally reproduce (sans rape maybe). Given such, why are people unfit to reproduce alive? If I ...
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1answer
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Can diet, supplementation and/or drugs affect sexual dimorphism?

After puberty, can certain diets, exercise, and/or possible drugs affect masculine/feminine dimorphism in adults? We know dimorphism and/or morphology is a product of genes, but to what extent can ...
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Is a female spider, well-fed by sexual cannibalism, less likely to mate again?

The Wikipedia page on sexual cannibalism (e.g. female spiders eating their mates) currently has a statement that sounds wrong to me, but I don't feel expert enough to edit it out: An additional ...
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Killing more attractive mates — intersexual selection strategy? [closed]

Is this the affinity or core part of intersexual selection (males fighting for access to females)? If females are bound to flock to objectively more attractive man 'A' in the majority of cases, would ...
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2answers
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Many black people I've met have bigger lips than white people, why? [duplicate]

I noticed that many black-ish people I've met have bigger lips than the white-ish people I've met. However, not all black-ish people have big lips. Is there any explanations in terms of natural ...
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What is meant by phenogenotypic disequilibria?

In Invernizzi and Gilman (2015), 5th paragraph of the introduction (see below), I came across the terms phenogenotypic disequilibria and more specifically the terms of positive and negative ...
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Is there a distinction between the fisherian runaway theory and Fisher's sexy son theory?

In many websites/books they are referred to as part of the same process whereby: "runaway" describing that the process continues even after traits become maladaptive the "sexy son theory" explains ...
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Is mate choice in non-human primates MHC-dependent?

Whether the major histocompatibility complex (MHC) affects or not mate choice in humans seems mired in controversy at the moment. Without implying that looking at non-human primates would solve this ...
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Does sperm weight causes sex ratio?

Chromosome X in female sperm is heavier than male Y chromosome. Does it causes difference in fertility of sperm and heavier female sperm is unable to fertilize better than male sperm? This is given ...
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How is “selection” best defined?

There is natural selection but there is also sexual selection which some regard as a category of natural selection. There is also artificial selection (by humans). The question is, what is a most ...
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Isn't heritability more important to genic capture than just genetic variance?

Rowe & Houle (1996) give two criteria for the selection of costly female choice: Condition dependence of sexually selected traits High genetic variance in condition Regarding heritability, ...
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Why would a human female have a sexual display despite male biased operational sex ratio? [closed]

why would a human female have a sexual display despite male-biased operational sex ratio? In human society there is a male-biased sex ratio, due to female child rearing, which results from anisogamy. ...
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What are the 2 general systems to understand the whole natural world? [closed]

In Graham Bell's book Selection, it's written: To some it may be a cause of regret that the natural world cannot be understood in terms of a single set of rules and laws, but at least, so far as ...
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Is there a kind of 'rule' which decides whether the male of female is bigger?

In human race usually males are larger than females, and probably is this for all primates. But some animals there are the females bigger, but what determines whether the male or female should be ...
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Is human “sperm warfare” a concept supported by biology?

I've recently read the "Sperm wars" book by Robert Baker. It deals with human sexuality and infidelity. The main premise of the book is that human male has different kinds of sperm: Regular sperm ...
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1answer
307 views

Why some traits are more desirable in the sexual selection?

For example, why do peacock females choose males with the biggest tail? If there is no advantage in such tail.
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Why does female's age of puberty inform on mating system?

Reading from Does increased calorie intake cause increase in libido in humans?, @AlexStone says: I'm aware that humans have a dual mating strategy - somewhere between pair bond and casual mating. ...
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1answer
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Are there examples of selection on males influencing female phenotypes?

I've been studying selection on female body color in a sexually dimorphic species and am intrigued by the possibility that selection on males, whether it be through sexual or natural selection, may ...
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Follow-up to The Red Queen by Matt Ridley? [closed]

I just finished reading The Red Queen: Sex and the evolution of human nature by Matt Ridley. Since this book is over 20 years old, I was wondering if more recent research made part of the book ...
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Why can't men produce milk, just like women? [duplicate]

This might seem a bit weird, but why can only women produce milk? Wouldn't it be more beneficial to our species if all humans could produce it? I can't think of any reason only one gender would need ...
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2answers
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Role of drift in evolution of sexually dimorphic traits

Is there a model for predicting how drift can affect the evolution of a sexually dimorphic (SD) trait? I've been trying wrap my mind around this paradoxical question; sexually dimorphic traits evolve ...
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1answer
117 views

term for species that produces males only to mate with mother or sisters

In reading about unique reproductive strategies I've run into two closely related and comparatively unique mechanics. Both involved a female who was born 'pregnant' with at least a male, but the male ...
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1answer
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Can sexual selection operate in temperature dependent sex determining organisms?

Or more broadly, are distinct forms of genetic inheritance (ie. sex chromosomes) needed for sexual selection? My thinking was that since there are no sex determining loci, there could not be linkage ...
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1answer
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Is there a mechanism by which mammals lose interest in a partner after mating?

I'm reading the book called "Cupid's poison arrow", which revolves around a rather simple assumption: most mammals, including humans have a genetic program that is responsible for ever increasing ...
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Are we more attracted to people of the same ethnicity? [closed]

Are humans more attracted to people from their own ethnic groups? I ask this because most of the time people have relationships with people of their own ethnicity, and I wonder if it's purely social, ...
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1answer
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Is the golden ratio of anatomic measurements universally beneficial for sexual reproduction? [closed]

It is often claimed, in popular media, that the golden ratio (Fibonacci series) in for example some face measurements is aesthetically (and hence reproductively) attractive with respect to the humans. ...
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1answer
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What is genodiversity good for?

I saw some documents which were trying to say that they can prove via sweat smell selected by women that humans are developed to find a partner with similar genes. At the first glance, I refused it as ...
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1answer
475 views

Selection Pressure on Orca Whale Coloration

What is the proposed selection pressure that leads to the distinctive coloration of Orca whales? I can find nothing in the literature.
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Why do we have more male infants born?

For every 104 male babies, we have 100 female babies and there are statistics which are more reliable. (Those tell us that we have 997 female infants born per 1000 male infants born.) What is the ...
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1answer
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Why estimate linear and full (linear, quadratic, and correlational) selection coefficients separately?

"We then fitted a linear regression including all three life-history traits to estimate the vector of linear selection gradients, β, for each sex (Lande and Arnold 1983). A quadratic regression ...
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1answer
578 views

Is sexual selection evolutionarily advantageous?

Our biology teacher says that peacocks will soon become extinct because of bigger and bigger (and heavier and heavier) tails. Why natural selection did not eliminate sexual selection?
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Why does sex last so long?

I wonder why (especially human) sex lasts longer than just a few seconds? My thought is that the shorter it takes a man to ejaculate, the lesser is the risk that he gets interrupted by a rival or a ...
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1answer
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Do gibbons have a monogamous sexuality?

the question is already in the title. If possible, it might be extended to: Have animal taxa (mammal) who tend to live in a family structure have a monogamous sexuality? Or are there cases of these ...
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Does unequal dominance mean the X-chromosome should be a coldspot for antagonistic variation?

Sexually antagonistic genetic variation, in a simple model, will persist if the benefit to one sex is (near) equal to the cost in the other, otherwise the polymorphism will be selected out of the ...
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Evolution of sexually concordant genetic variation on the X-chromosome

It was theorised in 1984 that sexually antagonistic genetic (SA) variation should more easily evolve on the X-chromosome. This is partly because female beneficial/male deleterious mutations face less ...
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1answer
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Why are men stronger than women?

What are the evolutionary explanations for why women are physically weaker than men (on average), and is this difference adaptive? See figure one here. I suppose that something puts pressure on men ...
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1answer
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Distribution of fitness in wild populations

If I get out in the wild observe wild populations and measure the distribution of fitness $f(w)$ in a given population. What will I find out? Will I observe a Gaussian distribution, a Poisson ...
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1answer
536 views

What is a sex-biased gene?

How do you define a male-biased gene and a female-biased gene as they are found in the abstract of this article.
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1answer
375 views

Definition of Sexual Selection?

How do you define Sexual Selection (SS)? (One might want to subdivide SS into intra- and inter- SS to answer) Is SS clearly different from Natural Selection (NS)? Is SS nested within NS or are NS ...
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1answer
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Advantages of bisexual reproduction over asexual one toward species promotion? [duplicate]

Are there any advantages of bisexual reproduction over asexual one towards species conservation and promotion? Do animals that have two or more sexes have more chances to reproduce? Does anybody had a ...
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Does any animal species have two sexes and more genders?

Are there any animal species that have two sexes and a kind of different internal diversification in two genders or more? I don't mean something like different-task-based diversity, but something ...
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1answer
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Sexual selection in cats or other animals

I was wondering if you could answer some of my questions regarding sexual selection in cats (or any other animals). I would like to apologize beforehand for my incorrect term use. When it comes to ...
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4answers
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What is the relationship between sexual and natural selection?

In Evolutionary ecology: Novelty makes the heart grow fonder, they say: Thus, it seems that the diverse coloration in this species is promoted by both natural and sexual selection. I had always ...
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5answers
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Do male animals visually perceive females as more/less attractive?

If we somehow remove pheromones, do animals experience a phenomenon similar to human "visual beauty" when looking at members of the opposite sex? For example, given a set of 20 female ducks observed ...
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2answers
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In what animal species is the sex ratio skewed in favour of the fertile female?

Ants have something like a single fertile female to several males. The same applies to bees, and larger animals - elephants too. Is the sex ratio universally skewed in favour of the female? What ...
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How can homosexuality evolve despite natural selection?

I would imagine that the answer to this question would be population control, especially since even if one sibling is homosexual this does not necessarily mean that the other siblings will be too.
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Why does sexual selection evolve beautiful features?

I have a very raw understanding of sexual selection: Say a group of females of a certain species "like" some feature of a certain groups of males; by "like" I mean some behaviour that makes this ...
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Do women have greater reproductive success than men? [duplicate]

What proportion of men who go through their whole lives and never find a mate at all, and what proportion of women do? And is the proportion of men greater than the proportion of women?
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Are there any mammals in which polyspermy produces viable zygotes?

Are there any mammals in which polyspermy produces viable zygotes? In the wikipedia page it is mentioned that there is a delicate equilibrium between female defenses against many sperms, which ...