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Questions tagged [reproduction]

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

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6answers
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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 ...
8
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4answers
297 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
365 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
209 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 ...
19
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15answers
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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 ...
170
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19answers
29k 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
141 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 ...
26
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24answers
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
728 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
359 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
343 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
232 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 ...
5
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2answers
109 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
403 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
488 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
votes
2answers
132 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 ...
8
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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
votes
1answer
201 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
votes
5answers
500 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
votes
3answers
262 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
votes
5answers
818 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 ...
3
votes
1answer
134 views

Plant-Animal reproduction

I'm designing an Anthropomorphic Lu-pine. (Get it? Cuz it's technically a tree, but it looks like a werewolf.) They are mobile, omnivorous plants, slightly larger than the average person. They are ...
7
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3answers
218 views

2-Dimensional sexual polymorphism - What chromosome system would allow this kind of reproduction?

"Polymorphism" is the name for when members of the same species exhibit different physical forms. The difference between male and female phenotype is an example of polymorphism in humans (and mammals/...
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votes
2answers
120 views

Supporting Larger Litter Size In Rabbit-Women With Minimal Deviations?

I had an idea for a race that is humans alchemically fused with various animals. One of the sub-varieties is rabbit-people, who have the famed bunny fertility. How might the bodies of the women be ...
0
votes
1answer
152 views

Realistic Shapeshifter Attempt

Imagine a sessile, multi-cellular slime like organism (or whatever necessary) awaits in a burrow or along a tree branch. Then an animal lands in its ooze and is trapped and soon paralyzed by its venom ...
5
votes
5answers
329 views

How can I use magic to make childbirth easier?

Going through labour is an intense and painful process that can last anywhere from 8 to 18 hours. It was also very dangerous for women during the middle ages. The lack of medicine and healthcare led ...
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1answer
85 views

Different Rates of Twins Across Different Races? [closed]

I heard recently that different races have different rates of twins/other multiple births, with individuals of Asian descent being the least likely to have multiple births, while those of African ...
12
votes
4answers
1k views

Are reproductive and excretory systems inherently linked? Could life evolve differently?

As far as I have been able to determine, the majority of life reuses the same plumbing for reproductive and digestive/excretory systems. In fact, the anus is believed to be derived from the male ...
-3
votes
3answers
162 views

Preventing dumb self-replicating machines to take over the humanity and potential case for the Fermi paradox [duplicate]

It could be that the solution to the Fermi paradox is that civilizations of biological creatures are typically destroyed due to being taken over by machines that are much dumber than the original ...
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9answers
3k views

What effect would a means of reproduction without pregnancy have on the population?

In sci-fi, we can find the concept of artificial fertilization and incubator quite commonly. I work in a company that's heavily involved in that technology, so I became curious to adapt this to my ...
7
votes
8answers
295 views

How to determine whose child is which?

So, on the planet Qualis, the sole dominant sapient species, the Qualians, a reptilian species, has a problem. Their species are oviparous, and their eggs need heat and protection. Qualian mothers ...
36
votes
21answers
13k views

Plausible cause of a family only giving birth to females?

I had an idea about a lineage supposedly cursed so that the women only give birth to more women, but I'm thinking that some outside force purposefully mutated/altered their DNA to cause the effect ...
11
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3answers
329 views

Hydras as parasitic-mating, polyandrous amphibians?

This is the second question in a series about my ongoing worldbuilding project, which seeks to explain the evolution and biology of various fantasy creatures. The first one was: Is petrifying vision ...
3
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1answer
251 views

Evolutionary Advantage to An All-Female Race? [closed]

In some fantasy works there are races, like some interpretations of harpies and mermaids, among others, that are all female, and need to seek out other races, like humans, to reproduce, the daughters ...
3
votes
4answers
576 views

Why would my advanced Dragon society forbid their young adults to engage in sexual activities

The Idea I currently play with the idea of a story where the protagonist travels a foreign world, visits places, studies customs hand history of locals, meets with survivors of historical events and ...
2
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1answer
156 views

Anatomically Correct “Thirds” [closed]

The concept of "Thirds" comes from the anime OVA series, "Armitage III". Basically, the people of Mars designed robotic women that were actually capable of getting pregnant and giving birth to human ...
5
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6answers
334 views

Reproductive Neck Darts

Yay my second alien sex question, I hope I am not arrested. Context Okay now to nitty gritty, So I got an intelligent species of Ostrich/flamingo looking creatures(this refers only to the shape, ...
6
votes
5answers
1k views

Bonobo-LIke Social Structure

Bonobos tend to solve disagreements through sex instead of violence, what might have caused this to evolve, or something similar to evolve in a sapient race of humanoids?
2
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6answers
502 views

Medieval “Morning After” Pill?

We've all probably heard of the "morning after" pill women take after sex to try and prevent pregnancy, right? Is it possible for a culture with largely medieval technology to create such a pill, or ...
13
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3answers
589 views

Egg Geometry--Shape of Eggs in Oviparous Humanoids

What shape would the eggs of a species of oviparous humanoids be? Eggs are common enough that you'd be hard-pressed to find someone who hasn't seen one. While birds' eggs are often thought of more ...
6
votes
3answers
301 views

Family planning for octopus?

I'm trying to layout a scientifically correct evolution path for the octopus to develop intelligence on the post-human Earth. I'd like to know if it's possible for an octopus mom to choose, or use ...
2
votes
6answers
233 views

How to make this species with specific constraints regarding reproduction viable?

While fleshing out the details of my species, I have some concerns regarding reproduction. This species has several constraints which make it difficult to get pregnant and reproduce. These include: ...
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votes
1answer
391 views

If we all became immortal at once, will we ever stop expanding the size of population? [closed]

Let's set the boundaries: Same earth, same time Overnight we all become immortals and totally indestructible Peoples never fall ill nor need to sustain themselves They actually can reproduce without ...
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1answer
154 views

Lisa's pregnancy support: is it practical for any pregnancy? [closed]

While Lisa is pregnant, she gets support from her husband and his grandparents. Robin ends up on double duty, both hunting and building because pregnancy makes it difficult for Lisa to hunt. His ...
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4answers
225 views

Cause of the Male/Female Birth Imbalance in “A Brother's Price”? [duplicate]

I stumbled across the tropes page from "A Brother's Price" the other day. Basically, the novel takes place on an alternate Earth in a country called Queensland, where only around one in every ten ...
0
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1answer
172 views

Shorter refractory period? [closed]

What could cause a humanoid race, or even a group of humans, to develop a shorter sexual refractory period (that is, the males can have sex again more quickly after an orgasm)?