Questions tagged [sexual-dimorphism]

Tag for questions related to the differences in appearance between males and females of the same species, such as in colour, shape, size, and structure, that are caused by the inheritance of one or the other sexual pattern in the genetic material.

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Are there any social-behavioural differences between the biological sexes in humans “proven” to have an evolutionary basis?

Long story short: women are from Venus and men are from Mars. But how much of the differences arose from evolution and how much of it comes from Venusian and Martian cultural differences? Jokes ...
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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 there a resource to query gene expression similarity? Stratified by sex?

We developed such a resource. The editors of "Bioinformatics" (at OUP) rejected the paper on the grounds that we did not run a comparison with "state-of-the-art" [similar] resources. Can someone help ...
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Are there mainstream views on the mandrill's coloration's being so unique?

According to the Wikipedia article: Mandrills are noted as being exceptionally colourful for mammalian standards. Charles Darwin wrote in The Descent of Man that "no other member in the whole ...
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Which scallops change their sex from male to female?

Tonight it occurred to me to look up what scallops are like when they are alive (beyond their culinary role) and it blew my mind. This post regards one detail about which I was unable to find specific ...
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Do women tend to have longer legs and shorter torsos than men?

I've always heard that women tend to have a greater leg length to torso length ration than men, and I think that my anecdotal observations of pedestrians of both sexes tend to confirm that. However, ...
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How to differentiate male and female mosquitoes at pupal stage?

There are many differences between male and female mosquitoes in their adult stage. But for my experiment, I need mosquitoes before they mate. So I need to sort them before they develop in to an adult....
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What are the absolute facial features which features sexual dimorphism in humans?

Apart from beard and moustache, is there any facial feature that would help to distinguish between men and women? It is said that men have square, rectangular or oblong face and women have oval,...
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Sex differences in response to food deprivation

This question was inspired by a casual conversation with friends the other night. Some of us had noted that women tend to eat smaller meals more often (snacks, fruits etc) while men eat larger ...
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Adam's Apple and Voice box

Why is Adam's Apple more prominent in males? Is it due to bigger voice box pushing the cartilage more, or is the cartilage indeed bigger than that in females? I am assuming bigger voice box as males ...
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Are humans not sexual dimorphic? Can genetic XY but SRY not expressed become pregnant? [closed]

My understanding was that XX/XY was how sex is determined in mammals, and so humans as well. A science teacher posted this regarding transphobia: "I just commented this on a transphobic post that ...
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Function of testosterone in women and estrogen in men

I was recently surprised to find out that testosterone and estrogen are found in both men and women albeit in different amounts. I know that testosterone is related to the development of facial, body ...
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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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Are Young Girls Stronger than Young Boys?

According to "common wisdom" the average man has, as a proportion of his body weight, 50% more muscle mass than the average woman. This is in addition to how the average man is several inches taller ...
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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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How prevalent is sexual dimorphism?

I'm writing a lab on sexual dimorphism (sex differences in phenotypic traits) and I want to include a sentence in the abstract that states how prevalent sexual dimorphism is. However, I can't find any ...
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Are there testosterone receptors in female mammary tissue?

Does female mammary tissue have receptors for testosterone hormones? Do male hormones influence female mammary glands, as female hormones influenced the male mammary tissue, such as in gynecomastia?
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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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How do non-dimorphic birds distinguish sex of possible partners/rivals?

Some birds, such as my pet Pionus chalcopterus, are not sexually dimorphic. People can't tell them apart, and even trained avian vets are not 100% certain with an inspection probing the vent. I ...
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Sex biased gene expression in the X chromosome

It has been shown that the X chromosome is frequently enriched for female biased genes, and has a deficit of male biased genes. For example in this paper, and this one. However, I'm struggling to ...
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Sexually homologous traits

When papers refer to traits as being sexually homologous do they refer to traits which are: a) present in both sexes but can be dimorphic (e.g. body size is sexually homologous because both sexes ...
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Is Batesian mimicry more important for females?

Myrmarachne plataleoides is a jumping spider that mimics the Kerengga or weaver ant (Oecophylla smaragdina) in both morphology and behaviour. However, the two sexes appear different: Myrmarachne ...
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What's the difference between male and female?

As long as we only look at humans the differences are clear: males have chromosomes XY, produce sperm and don't get pregnant. Females have chromosomes XX, produce egg cells and bear babies. But when ...
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Is there a standard formula/calculation for sexual dimorphism?

Is there a standard, or most accepted, way to present a value for sexual dimorphism? For example, one could use $$\frac{\text{Female value}}{\text{Male value}} -1$$ This would give negative values ...
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Why only female mammals have well developed mammary glands?

In course of evolution (possibly), mammary glands became vestigial in male mammals, but became fully developed in females. Is there any plausible explanation for this characteristic?
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Are there any mammals whose males can feed with milk? [duplicate]

Are there any mammals whose males can feed the offsprings with milk from the breasts?
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Are there anatomical differences between male and female mammal brains before action of hormones?

is there any evidences of these differences during development stages prior to hormone driven sexual differentiation? mice studies ?
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Main mechanism of the evolution of sexual dimorphism

Sexual dimorphism is very common and (normally) requires the evolution of sex-specific genetic variation/regulation so the genetic correlation between the sexes can be <1. Is there consensus as to ...