Questions tagged [reproduction]

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

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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
128 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
107 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
115 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 ...
4
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3answers
124 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 ...
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2answers
163 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 ...
1
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2answers
146 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
279 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
309 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
324 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
414 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
153 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 ...
38
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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
280 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 ...
5
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4answers
358 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
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6answers
845 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
160 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
277 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 ...
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6answers
1k 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 ...
11
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2answers
333 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 ...
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12answers
540 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
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12answers
4k 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
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3answers
239 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 ...
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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
394 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
424 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
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2answers
244 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 ...
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15answers
6k 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 ...
171
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19answers
30k 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 ...
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3answers
291 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 ...
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25answers
9k 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
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5answers
766 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
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6answers
421 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
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10answers
384 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
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3answers
252 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 ...
13
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7answers
2k views

Why would a drider lay only a small clutch of eggs?

In a very soft-science world, in a lush forest far away from civilization and their laws, especially the one about squares and cubes, lives a young, female drider. One day, while hunting for dire-boar ...
12
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8answers
4k views

How could an abortion cause infertility in a witch?

Orgone is the natural life energy of the cosmos and the lifeforce which allows the body to function. It is used to perform spells, and constantly regenerates after use at different rates for an ...
5
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2answers
148 views

Pangenesis and alien life

Darwin's hypothetical mechanism of inheritance was called pangenesis, whereby the body continually produced particles of information - gemmules - which aggregated in the gonads, and that that the ...
6
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6answers
990 views

Pros and cons of hermaphroditic vs sexual species?

Between a species that is hermaphroditic and a species that has males and females, then what would be the pros and cons of either one from a biological standpoint? Anything not regarding the biology ...
10
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3answers
512 views

Is it plausible to make human gametes from different parent chromosomes?

I'm creating a near future world where laboratories could create human gametes (sperm & ova) using chromosomes from different people. So theoretically we could take 1st chromosome from a 1st ...
15
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6answers
2k views

Hypothetical maximum number of embryos from one woman?

I am working on a setting in which there are a very limited number of human females remaining, and the intent is to repopulate as quickly as possible. Given a modern level of medical technology, what ...
5
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2answers
133 views

Why should magical created sand-bugs never stop multiplying?

My world is a medieval-magical setting like in "The Dark Eye". An extinct, magical elves-race had a technique to raise "bugs" from sand, but other materials were possible too. Those bugs usually had a ...
9
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5answers
1k views

Bioengineered reversible sterility

The Humern empire is vast, unbelievably powerful and (in certain matters) brutally authoritarian. One such issue is that of reproduction. In order to ensure that all subjects of the Empire remain ...
2
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1answer
249 views

What would humanoid hermaphrodite family units look like? [closed]

My elves are hermaphrodites, but they need another partner to actually reproduce. Their pregnancies last for about two years, and pregnancy is very physically tolling. They usually give birth to one ...
9
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4answers
544 views

Why would an entire biosphere evolve to reproduce with three parents instead of two?

So I have an alien biosphere in which trisexual reproduction predominates. As far as we can tell, trisexual reproduction does not offer an advantage when it comes to shuffling genes. The biological ...
13
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7answers
3k views

Why are cambions unable to reproduce amongst each other?

There is an ancient, satanical practice that is performed in this society called the sabbatical. This ritual takes the form of a festival, in which witches get together and discuss recent events, ...
3
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3answers
308 views

How can a change to the male refractory period affect the hierarchial structure of the family? [closed]

In this world, the cost of reproduction for males is higher due to the refractory period being much longer. After ejaculations occurs, the testes must take time to produce sperm once again. This can ...
2
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5answers
1k views

Is the Concept of Multiple Fantasy Races Scientifically Flawed? [closed]

Many fantasy worlds have multiple humanoid species (elves, orcs, humans, etc) living in the same world, in addition to that, they often have the ability to interbreed. And I can't help but question ...