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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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199 views

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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113 views

Why do women process oxygen faster than men?

https://www.newsweek.com/women-are-better-athletes-men-study-about-gender-fitness-says-736047 is the source that I use. Is it reliable? What's the evolutionary advantage to women being naturally more ...
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1answer
3k views

Strength of Female Chimpanzees vs. Male Chimpanzees?

Where can I find studies done on the strength dimorphism between male chimps and female chimps? For example, "one-arm pull strength is 300 pounds for male chimps and 200 pounds for female chimps"
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What causes change of sex in certain monoecious plants such as Papaya?

certain male flowering plants can be converted to female flowering and fruiting such as Papaya plants by just insertion of an iron nail in their/it's stem near it's roots? How can iron nail alter it ...
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Sex change in fishes

When in a flock/school of gold fishes, if male fishes are removed due to some reason and only female fishes remain. It is said that after sometime one of the female fish will turn into male and the ...
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161 views

What are the evolutionary reasons behind men being taller than women?

Human men and women are sexually dimorphic: there are some phenotypic differences between men and women. Men being taller than women is an accurate stereotype. Overall, men are on average 13 ...
31
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2answers
5k views

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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2answers
13k views

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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85 views

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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1answer
74 views

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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34 views

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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0answers
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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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1answer
652 views

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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1answer
4k views

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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1answer
227 views

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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0answers
210 views

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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1answer
365 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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2answers
336 views

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 ...
5
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1answer
149 views

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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1answer
2k views

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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1answer
955 views

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 ...
5
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1answer
530 views

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 ...
3
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1answer
173 views

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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2answers
233 views

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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1answer
420 views

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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2answers
165 views

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 ...
3
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1answer
157 views

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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1answer
240 views

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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0answers
283 views

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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2answers
2k views

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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44 views

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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1answer
425 views

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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1answer
334 views

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 ...