Questions tagged [reproduction]

For questions about the means and methods any species, organism or entity uses to propagate itself.

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1 answer
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If human babies are born underdeveloped, how long would pregnancy need to be in order to be considered fully developed? [closed]

In my world there is a certain sapient species with height around 3 meters, whose bones are more durable than humans, meaning they can afford wider pelvis than most human women I personally believe ...
16 votes
16 answers
6k views

Is there a paternity test method given medieval level technology with low false positive rate?

Determining genetic fatherhood is very important in my worldbuilding experiment for lots of reasons, one being succession, but regardless it's the genetic component that's important But it's possible ...
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-1 votes
2 answers
128 views

What characteristics would my Enslaver Aliens find attractive in each other? [closed]

Each photo I have here is that of an Enslaver Alien. Thank you midjourney for helping me create these creatures. They are an alien species that can grow to the size of a fifteen story building and are ...
0 votes
2 answers
161 views

How can sperm become embryos without ovum or eggs? [closed]

How could I make sperm become an embryo or turn sperm into ova so the embryo is grown inside the sperm and then grows in size until hatching in water like external fertilization and get paternal ...
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2 votes
4 answers
2k views

What are the evolutionary advantages of males wanting females to mate with other males? [closed]

What would cause males to evolve to want the females to mate with other males? Males use mate sharing as a bonding method for males and to combine their bloodlines with unrelated males to gain ...
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-2 votes
4 answers
509 views

How would men survive without women?

What could make a male-only human reproduction system exist, which makes women obsolete, expendable, and also gives men full control over their paternity?
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3 votes
3 answers
388 views

How to make sperm competition impossible for males?

How to make an reproductive system where the males have 100% guarantee of their paternity and make cuckoldry and sperm competition impossible similar to seahorses,where the males get pregnant and can ...
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5 votes
5 answers
353 views

How would sexual reproduction work in a species with three different sexes?

For the purposes of this question: The species is multi cellular and from an animalia like kingdom. Sex is only physically possible when 3 individuals of all 3 sexes are present together. With only 2 ...
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2 votes
2 answers
166 views

Is it possible to have a planet where most of the sexually reproducing organisms are monoecious?

Creatures on Earth has 2 modes of reproduction, sexual and asexual. Most species employ only one of the two strategies, but a handful use both. Those that engage in sexual reproduction are either ...
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2 votes
2 answers
176 views

Would humans crossbreeding with animal people cause more birth defects? [closed]

I am working on a world inspired by witcher where humans and animal like race live together. would for example, human crossbreeding with water dwelling humanoid cause something like mermaid syndrome? ...
13 votes
12 answers
5k views

Do androids left on their own have any hope of replicating?

The scenario goes something like this: In the not so far future a fully automated exploration vessel crashes on an uninhabited planet not unlike earth. Unlike earth however, this particular planet is ...
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-2 votes
1 answer
126 views

Impact on genetic diversity with 6 person mating groups

Context I know enough about genetics to know I need to ask others. I'm writing an alien humanoid species that revers the number 6 as part of their culture and religion. Their marriage equivalent forms ...
-1 votes
6 answers
251 views

What kind of reproduction methods would allow for an only male animal species to exist?

I was reading that there are certain species of starfish which fission made them in some locations to have a scarcity of female starfish and in other locations there are species which only male ...
13 votes
10 answers
966 views

Why and how would a species reproduce exclusively by converting other sapient beings into more of their own kind?

In a story I'm just beginning to write, the aliens who have invaded Earth have a ghastly secret that is about to become known: They reproduce exclusively by transforming other sapient beings into more ...
1 vote
5 answers
192 views

Can fertility be tied to an individual's strength?

So I've got this species of nocturnal humanoids that reproduces asexually, or rather, they use a form of parthanogenesis for their reproduction and have only one sex. I've got them figured out for the ...
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2 votes
6 answers
545 views

What is the stumbling block for a world of "Alphas"? [closed]

In 149597871's utopia, there will be no need for that as only a small minority of "alpha" males would be allowed to impregnate girls while the rest of the (beta) men will only support them ...
3 votes
1 answer
179 views

How could my hybrids from species of the same genus with radically different appearance have more fertility issues but still be mostly fertile?

I want to know if my interspecific interbreeding is realistic or a total fiction. Most animal hybrids are sterile (mostly the heterogametic sex according to Haldane's rule). Some famous examples ...
4 votes
3 answers
135 views

How long would a species have to have this brain symbiote to prevent early puberty?

So, a race of sapient aliens I designed for a series of short stories owes its sapience in part to a symbiote which lives in their brains and produces hormones that induce the brain to grow faster and ...
3 votes
5 answers
162 views

Minimum Group Size for Sterile Workers?

Essentially, I'm planning on designing a race of sapient aliens with a sterile worker caste, but I have one big problem: On earth, sterile workers castes are only found in groups of thousands or ...
1 vote
3 answers
125 views

What is fastest believable growth rate and reproduction cycle for a 150-300-meters-tall tree?

The trees in question are 150-300-meters-tall, 18 meters in diameter and have no branches except at the very top where each branch has a single leaf that takes up the whole branch. Its bark is thick ...
1 vote
3 answers
130 views

Self inflicted extinction in a modern setting - Plausibility and Duration?

Suppose there exists a species of humans which are better physically, mentally and aesthetically(in a conventional way) by at least three standard deviations(any large margin will do) when compared to ...
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4 votes
3 answers
1k views

Can a plant or alien plant have fruit and shoot seeds as well?

On my planet Chlorea there are desserts and in them is a tree-like plant. During the dry season nothing really happens; the plant saves water, they lose leaves to save water etc. But in the wet season ...
9 votes
7 answers
5k views

How do the eggs of birds that fly using their legs not crack?

I've been designing bird-like creatures that both fly and walk using their legs, saving the trouble of growing extra muscle mass for both. Because of this they have an odd look for birds: They have ...
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3 votes
1 answer
80 views

What is a good rate of growth of size and numbers of creatures that start with a microorganism?

I am thinking of a story where a meteor carrying a microorganism lands into some hot spring mountain caverns that between a city and a desert and evolves to be able to able to take DNA samples from ...
1 vote
4 answers
309 views

How could these aquatic humans survive and reproduce?

The aquatic humans resemble regular terrestrial humans almost perfectly as adults. This means they have hands, feet, and all of their bodyparts identically to humans (H. sapiens sapiens) As children (...
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7 votes
4 answers
1k views

Anatomically Correct Vegetable Lamb

The vegetable lamb is a plant that has a sheep for fruit. These sheep are quite similar to natural sheep, with legs, guts, and wool in the same anatomy as a sheep, and are attached to the rest of the ...
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5 votes
2 answers
150 views

Reproduction via male gonad transfer

A major issue for many earth species is finding a mate when you need one. This problem is particularly acute for species that live in sparse environments (e.g., deep sea benthic zone) and those that ...
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7 votes
2 answers
400 views

Choke on the bitter fruit of my demise

In death a new beginning is certain, for the jaws that bit my flesh will suffer a tragic end and no amount of laments or tears will ease the pain. My blood will flower and fruit inside their bodies, ...
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9 votes
7 answers
3k views

How can a male klepton species sustain a settlement without kidnapping women?

The male klepton is a unique humanoid. It has no females, and reproduces by mating with other humanoid females, who bear children that are clones of the klepton father. No females are born, and all ...
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4 votes
6 answers
613 views

Reptilian beauty standards

This isn’t limited to lizard folk but humanoid reptiles in general. The most common mistake I see when designing females of a reptilian race is to give them human breasts and proportions, despite them ...
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0 votes
6 answers
277 views

Winning the game of life

all lifeforms alive today want to live and reproduce as much as possible, because those with differing ideas are extinct or about to be. Clearly the meaning of life is nothing else but to keep your ...
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3 votes
6 answers
446 views

Any given couple is either only capable of having sons or only capable of having daughters [closed]

Consider a world in which every human is divided into two groups: call them Group 1 and Group 2. There's a completely random 50/50 shot for everyone to end up in each one, and it's not genetic or ...
4 votes
4 answers
1k views

Would marriage exist in a parthenogenetic human society? [closed]

I'm working on something about an all-female human society modeled on real single-sex parthenogenetic species like the famous Whiptail Lizard. A few of the things I'm borrowing from Whiptails are: ...
2 votes
1 answer
102 views

Explain the concept of "two haploid eggs fusing to produce a single diploid embryo"

So I'm creating a society that is hermaphroditic (specifically what I really want is a society where there's only one gender and both sexual partners experience pregnancy) so I've been doing research ...
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1 vote
4 answers
249 views

Could an intelligent alien species reproduce via pollen?

Could a sapient, animal-like alien reproduce with pollen and ovules, rather than directly producing sperm and eggs?
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5 votes
3 answers
453 views

On the plausibility of both sexes producing gametes on demand

In most animals there is a different way of producing gametes: the male produces them "on demand" at the time of the reproductive act, while the female produces them on a roughly "fixed ...
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6 votes
3 answers
532 views

How long should an egg-laying species of human size and intelligence gestate and incubate its eggs?

In my fantasy world I have a species of reptilian humanoids. Their body mass, lifespan and overall intelligence is about the same as humans. This probably means similarly sized brains. They are NOT ...
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5 votes
5 answers
273 views

Sex determination that would explain the complex reproductive system of my aliens?

Phemogian are a seven-sexed species that passes gametes in a chain. Each sex can inseminate one other sex and be inseminated by another sex. Each phemogian has three parents, with the last parent in ...
9 votes
12 answers
5k views

What would make human males an inefficient option for spreading alien genes?

An alien species colonizes worlds across the galaxy, expanding its empire and propagating its race. However, it doesn't do this by subjugating the inhabitants through force, as its technology is too ...
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4 votes
1 answer
282 views

Anatomy of a sexual "parasitic" specie with small and intelligent females but large and “brute” males

I already made a similar question searching for possible features which can make this fictional specie biologically functional, so this question can be considered a second part of this. I would ...
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0 votes
4 answers
214 views

Would the crew of a generation spaceship obey population control for a century? [closed]

I'll try to keep this concise and focused on the question at hand. A generation spaceship leaves Earth around the year 2060 on a journey to Alpha Centauri A. Thanks to fusion power and other new tech ...
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1 vote
0 answers
108 views

Why does an Insectoid species that reproduce via deuterotoky still have males [closed]

Say you have a (sentient Hive-minded) bee-like alien, that functions pretty much like a earth bee: Builds hives, the only fertile female is the Queen, has different castes, drones are only there to be ...
12 votes
6 answers
737 views

Would larger humanoids be able to give birth to less "undercooked" babies?

I'm working on the biology of a fantasy race of very large human-like beings (think something like the Vrykul from WoW or the Norn from Guild Wars), and got stuck on one aspect of their development as ...
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3 votes
3 answers
263 views

Can two species of different dimensions hybridize and successfully produce offspring?

I was just wondering: In some alternate 3-dimensional universe, could a 3-dimensional and a 5-dimensional version of an alien, whose cross-section appeared in the 3-dimensional universe, successfully ...
11 votes
1 answer
493 views

Evolution of sexual parasitism in a species with small and intelligent females but large and "brute" males?

So, I had this idea about a sapient alien specie paritally based on the reproduction of the schistosoma A flat worm specie in which the male is notorious bigger than the female, and this have a ...
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12 votes
7 answers
4k views

How would interspecies lovers with alien body plans safely engage in physical intimacy?

Now I had previously asked how a loving interspecies couple would work around very Alien Body Plans that is now sadly closed (How will interspecies lovers overcome different body plans?) That question ...
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3 votes
3 answers
384 views

What would make a biological host compatible to bear an eldritch child?

Artificial incubators have become the most common way of producing children, to the point where old methods are shunned as backwards. Over 90% of the world's population are born this way, a it has ...
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0 votes
1 answer
200 views

Human-Alien Hybrid Babies (18+) [closed]

Okay, I have stories with interspecies sex, complete with viable offspring. What kind of gene editing would be needed for that to even work, and how would the resulting child's genes be expressed? And ...
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2 votes
1 answer
392 views

Would a sexual dimorphism like monkfish be useful for bigger or terrestrial animals? Would it bring an advantage or would be more harmful? [duplicate]

In the monkfish, the females are the larger sex, while the males are very small: in comparison males measure only one tenth of the female, for example a female can measure up to 20 centimeters long ...
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4 votes
3 answers
723 views

The necessary secondary characteristics of a humanoid, sequentially hermaphroditic race

I'm stewing on an idea about the people of Earth encountering a humanoid race exhibiting a pregender phase. After a period of time, this pregender develops into either male or female based on ...

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