Questions tagged [reproduction]

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

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6
votes
4answers
69 views

How does a species with heat cycles deal with over population?

I'm at the very early world building for a potential story where I have a sort of humanoid feline species that I need to have been known as expansionist and/or war-like in the past but not be ...
13
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3answers
2k views

Can humanity survive if all people are born females and later become males?

In the real world all humans start off as females in the womb and then develop male organs before being born. I'd like to expand that concept further to the humans in my world. In my world, humans ...
13
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6answers
5k views

Why haven’t scientists found evidence of humans interbreeding with aliens?

In my alternative universe, Atlantis was a real city that existed, although it wasn’t called Atlantis or founded by humans. Atlantis or rather, Dosham was a city on an isolated landmass in the ...
2
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2answers
111 views

What would cause a sapient race to evolve oral castration as a core cultural part of reproductive intercourse? [closed]

I'm trying to insert a bit of weirdness into the world I'm building, and one of the ideas I'm toying with is to have one of my 3 alien races practice oral castration as a core part of reproduction. ...
5
votes
3answers
208 views

Genetics and Population Dynamics of a 7-sex system

One of the respondents in this thread suggested a 7-sex system with the following features: An idea I came up with years ago was a variation on the male/female/carries-offspring idea. This species ...
2
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3answers
252 views

Could a species be able to be impregnated by anything?

Is there a way for a species to essentially become a living incubator of sorts? Not the other way around, as in Plausible ways for the alien species to be able to impregnate every and any species?, ...
28
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24answers
6k views

Why would a 'first world' alien opt to have a brood of dumb children rather than one smart one?

Yttri are an odd race. Like many species on their planet they can selectively position themselves along the r/K reproductive strategy spectrum. r species are those (like some species of frog, fish or ...
7
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4answers
611 views

Through Uterus/Reproductive System

Early life, and many modern organisms have what we call 'blind guts'. Food enters and exits via the same opening. However, that is inefficient and has been widely replaced with 'through guts'. Food ...
2
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3answers
142 views

Could Reptiles Be Simultaneous Hermaphrodites?

Reptile reproduction, it turns out, is more flexible than our own. Whiptails, a girls-only species, can lay unfertilized eggs without the need for a male. And Komodo dragons have recently been ...
0
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5answers
201 views

How can I force siblings to fight each other for the privilege of being born?

When Lilith was kicked out of the garden of Eden, she was forced to fend for herself in a harsh, unforgiving world. Lost and alone, she came upon a bloke named Satan. Their love produced two children ...
3
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2answers
232 views

Would the human population increase without ''natural sexual discouragement''?

I read a theory once which stated that the natural pain, sickness and general discomfort that humans can experience during sex, pregnancy, and childbirth help control the human population by ...
3
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3answers
249 views

Decimating humanity though no daughters gene - when and where to introduce it?

At one point in the past, a man had a mutation on his Y chromosome. Anyone with the mutation would only produce Y sperm, and only have sons. My plan is to have this have a big impact that threatens to ...
8
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6answers
2k views

Why might a vampiric race have low birthrates?

This pure-blood vampiric race is not immortal, but their lifespans are about five times that of mortals. This race has lived in a vast city beneath a small mountain range for thousands of years (the ...
10
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6answers
2k views

To what extent is it feasible for this race to be majority female?

In my world there is a race of humans who are disproportionately female. They are closely derived from and very similar to real-world humans, but are unable to interbreed with the other races as they ...
5
votes
1answer
158 views

Would it be feasible to determine whether or not a humanoid species is fertile in less than a week?

So, as one of the many, many consequences of modern day humanity being given access to a runic magic system by an unknown party, nearly the entire human race discovers one morning that they've been ...
5
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1answer
170 views

Could a species that practices maternal dermatophagy develop sapience?

To preface, this is a hypothetical alien creature unrelated to Earth life. I want my aliens to have a mechanism similar to some caecilians, where upon giving birth, the mother grows a layer of ...
3
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1answer
143 views

Physical causes of multiple births in humans?

The setting I'm building has a race of people, derived from modern humans, whose primitive survival as a species relies partly on very fast reproduction, and I think I want them to have a tendency for ...
5
votes
3answers
150 views

Size of a litter for a carnivore with a high rate of death

So, I'm designing an alien race/civilisation of carnivore. I was thinking of a very aggressive specie, who is both the alpha predator of his world and his own main cause of death. Basically, a lot ...
0
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2answers
198 views

Social implications of complete separation of copulation and reproduction [closed]

The Twelve Kingdoms is a fantasy novel series written by Japanese author Fuyumi Ono, and has been made into an anime series. In this series, humans, and indeed all other motile beings, are born of ...
2
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3answers
234 views

What configuration would provide the most protection for a male dragon's reproductive organs against mechanical and chemical attacks?

Dragons awesome (that's why sub-par writers and DMs use it as a substitute for an actually engaging story/setting) but they're still just animals, animals that reproduce. Besides it's painful to get ...
2
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5answers
359 views

Can a mammal and Oviparous have child together if they have similar external body structure?

There are two humanoid races are in my fantasy story. Race A is almost like humans, except they are in super human size, have super human strength, have a higher body temperature etc. Some sort of ...
8
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4answers
373 views

How would a 4th trimester affect human development?

Newborn humans are born in a very undeveloped stage compared to other mammals. This is because if they stayed any longer in the mother, their head would become too big to fit through the birth canal. ...
13
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5answers
352 views

Where are all the non-aquatic mouthbrooders?

Some fish mouthbrood. Some amphibians mouthbrood. Crocodilians carry their babies in their mouths to water. Is there a reason why there are no instances (that I know of) of terrestrial animals that ...
8
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4answers
459 views

Alien life interbreeding with Earth life [duplicate]

I had an idea for a planet which, millions of years ago, was accidentally contaminated with various animals, plants and microbes from Earth, and - via the planet's native aliens' bizarre reproductive ...
2
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3answers
160 views

Could a mammal procreate if it existed out of multiple sets of DNA in different cells? If so, how? [closed]

I was wondering about creating mammals that consist out of multiple sets of DNA and if they could procreate. I am talking about a singular being that isn't composed out of multiple seperate parts ...
39
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5answers
7k views

What could a reptilian race tell by candling their eggs?

I've got a D&D-inspired setting, and one of the races present are yuan-ti. They're sentient snake people with a variety of forms, ranging from mostly human-looking to basically just a giant ...
3
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5answers
314 views

Would having more than two sexes decrease the number of individuals required to have a sustainable population from a genetic perspective?

On a world made up of many small islands, each island cannot support a very large population. Although sometimes individuals from one island make it across the ocean to another, this is usually a ...
7
votes
7answers
552 views

Could an all-male society exist?

I'd like to create a sci-fi story with a country or planet where only men are allowed to live and they use in vitro gametogenesis and ectogenesis (artificial womb) to have children without any woman. ...
8
votes
7answers
938 views

What would prevent chimeras from reproducing with each other?

There exists a polymerization spell that allows distinct animals to combine with each other, creating an entirely new creature. The beasts in question are held in transumutation circles linked by ley ...
1
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1answer
191 views

How do ghouls reproduce? [closed]

In this world, ghouls are real: undead, zombie-esque creatures that consume dead flesh to survive. Unlike typical zombies, these ghouls are as intelligent as humans; they tend to build lairs near old ...
-1
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3answers
310 views

How many babies can a human women safely be pregnant with at once? [closed]

Most pregnancies result in 1 baby, sometimes there are twins. Every now and then there are triplets. My guess would be that 4 at once has happened before too. But 5? How about 6? Surely not 7. How ...
11
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6answers
2k views

What kind of environment would favor hermaphroditism in a sentient species over regular, old sexes?

I'm trying to create alien species that is hermaphroditic, with strong sexual conflict. In essence each being tries to trick or force (by mechanical or hormonal means) its partner to take role of ...
10
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2answers
397 views

Speculative Biology of a Haplodiploid Humanoid Species

In haplodiploid sex-determination system, female/diploid individuals are developed from fertilized eggs by means of sexual reproduction, while male/haploid individuals are developed from unfertilized ...
14
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3answers
2k views

Could a cockatrice have parasitic embryos?

I had an idea to make cockatrices "realistic" (as in make a bit more sense) for what ever reason the noble cockatrice has evolved to use other species eggs for its own. It does this by "sitting" on ...
1
vote
12answers
631 views

How could a same sex couple have children?

In my current work, I want same sex couples to be fully integrated in society. As it is set in a medieval fantasy world, survival of the human species relies on having children, so same sex couples ...
14
votes
12answers
5k views

Is a naturally all “male” species possible?

The Orville has Mochlans, an (almost) all-male species. They reproduce in some unexplained method that produces a fertilized egg. The issue here is that if one of the mates lays an egg and the other ...
9
votes
4answers
291 views

How can a long lived species that reproduces slowly prevent themselves from going extinct?

We Eldar are a beautiful race that have a maximum life span of 500 years. We are stronger, faster, more intelligent, sexier, and frankly just superior to you humans in every way. However, we cannot ...
15
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6answers
5k views

How could a female member of a species produce eggs unto death?

As far as I am aware, female mammals cannot produce eggs (as in ova) after a certain age/maturation. How could the female produce eggs for an unlimited amount of time, resulting in a 'queen' mammal ...
10
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4answers
425 views

Could you engineer a baby for a same sex couple?

Kikazaru and Protogon have been fierce rivals in the designer baby industry/artificial wombs since time and memorial, but Kikazaru is looking to finally best its rival by introducing a new scheme: ...
6
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2answers
513 views

How long would gestation period be for dwarfs?

Dwarfs are intelligent creatures, with stronger bones and muscles but smaller than humans. They live mostly under ground (caves, mines, etc.) and reproduce sexually. How long the gestation period ...
7
votes
2answers
275 views

What circumstances would ensure that hybrid species of frankencats are produced in the wild naturally?

I am a mad scientist with an intelligence matching Albert Einstein and Steven Hawking, and plan to create a new species of animal. After watching Napeoleon Dynanite, widely considered by critics to be ...
20
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15answers
7k views

If angels and devils are the same species, why would their mortal offspring appear physically different?

Angels were all originally part of the same race before the war in heaven, when the ones that rebelled were cast out and sent to hell. The humans on earth were similar to angels, but without the ...
174
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19answers
31k views

Russian Dolls - How do they reproduce?

Warning picture showing dissected Russian Doll My theory I believe that Russian Dolls reproduce asexually. They are born pregnant. At the time of birth, the outer doll dies. What is now the outer ...
1
vote
3answers
357 views

Self selective breeding humans [closed]

Many dogs, as well as other animals, were bred to the point of becoming nothing but mere tools or toys. For example, wolves certainly were already strong, fast, or intelligent creatures but some ...
29
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25answers
10k views

Elf-like race: What could prevent overpopulation?

For an elf-like race whose people do not age beyond physical maturity (the accumulated DNA damage associated with aging does not occur), what would prevent overpopulation? This elf-like race is ...
11
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8answers
4k views

How can I maintain the demigod powers of my clan while ensuring the purity of its bloodline?

We, the house of Habsburg, are a royal family that descend from the gods. Our founder, Cersei Habsburg, conquered Europe and brought peace and stability to the dregs of the continent. After taking her ...
5
votes
5answers
817 views

Why would a species require multiple inseminations in order to reproduce?

The Eldar are a psychic species with a similar body design to humanity within a galaxy-wide empire. They are far more advanced than other races, technologically and philosophically. Eldar have a ...
8
votes
6answers
539 views

How can a planet full of zombies reproduce and maintain its population?

How can we have a world that is inhabited only by zombies and yet continues to be populated? For the purposes of this question, I envisage the type of zombie that has been infected by a virus, is ...
7
votes
10answers
408 views

Logical reason why would the bunker population use Wastelander DNA samples?

It’s been a little over 190 years since WWIII, AD 2157. Most of the surviving human population live in small farming settlements, tribal villages, or, if lucky, United City States. But, there exists a ...
0
votes
4answers
323 views

How can I alter humans to allow them the ability to choose the sex of their child in the ancient world?

Research shows that some creatures in the animal kingdom manipulate the sex of their child in order to maximize the number of grandchildren. Parents in good condition, based on health, size, dominance ...