Questions tagged [genetics]

For questions about a way to pass on biological information from one generation to the next.

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1 vote
3 answers
385 views

How many generations could a small group go without suffering the effects of inbreeding

With a group of 12 couples straned on a island how many generations could the go before becoming infertile due to inbreeding?
8 votes
5 answers
2k views

Would a brain transplant suffer immunorejection if the new body was cloned from the original?

So, having rejected mind uploading in their quest for immortality, the people of my worldbuilding project now seek to develop brain transplanting. The main problem is immunorejection; if you simply ...
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5 votes
2 answers
164 views

Alt. Biochemistry - Which of these is a suitable alternative/mirror to DNA?

This question is tied to the “Glass Trees” question I asked earlier which everyone seemed to like. Since y’all had such good opinions on that, I figured I’d bring this particular quandary to y’all in ...
2 votes
3 answers
369 views

What would the technical problems be of mass genetic editing? Keidran Animal-Human Hybrids

The Setting I hear you, I'll make this brief. It's been almost 30 years since the Aurea slow cargo ship arrived at Ilus. When they launched the Aurea, almost a century ago, they had the technology to ...
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2 votes
2 answers
116 views

In a righty-dominated society, how can authorities prevent a right-handed child from being born to two lefty parents?

In this society, superstitions regarding right- and left-handed people are accepted as fact. (I'm going to be politically incorrect and call them "righties" and "lefties" ...
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-4 votes
4 answers
232 views

Is complete melanism possible in humans?

One of my characters has a genetic disease called "Complete Melanism". Her eyes, her skin, her hair, and her internal organs are all black. Like a famous Indonesian breed of chicken. The ...
2 votes
2 answers
295 views

How could a human develop magenta irises?

I'm writing a character and they have bright magenta Irises. How could I explain the reason why they have that feature?
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1 vote
2 answers
189 views

Does it make biological sense for primates to come in every possible hair, skin, and eye color? [closed]

There are a lot of Japanese shows and games where people have many different hair colors and eye colors. There are even cartoons and games where people come in every skin color in the rainbow and ...
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2 votes
2 answers
104 views

How to have 'easy' sexual morphs in individuals with two identical sex chromosomes in species with XY or ZW sex determination?

Humans and many mammals have an XY sex determination system. This means that the presence of a Y chromosome makes an individual male, while having 2 X chomosomes (and lacking a Y chomosome) makes an ...
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3 votes
1 answer
54 views

Genetically variable cells that through natural selection achieves evolution in a single individual

I posted a question some time ago about how could genetic engineering design people that could adapt to changing conditions beyond what simple acclimatization or activation/deactivation of genes in a ...
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2 votes
2 answers
335 views

How could a species have two sex-determination systems?

I imagined a tetraploid species of teleost. This species has both XY and ZW sex-determination systems. I call this strange thing the VYW sex-determination system. Genetic females have three V ...
6 votes
2 answers
181 views

Do we have predictive knowledge of gene editing outcomes for heretofore unseen traits?

We can know what genes affect what outcomes by following the trail backwards, but can we predictively know what changes to what genes would result in completely different and previously unseen ...
3 votes
6 answers
424 views

Is it possible to breed extremely peaceful humans?

There is a dictatrix (female dictator) who is a well-intentioned extremist. She wants to make humans as peaceful as capybaras by only permitting humans who are empaths/sympaths to reproduce, humans ...
0 votes
1 answer
40 views

If a hypothetical person was extremely sensitive to consuming sugar, would that imply that their glycome was worthy of study? [duplicate]

For my sci-fi notes, I’m truly to figure out if the glycome of an alien allergic or intolerant to sugar would have a glycome worthy of study, that would be different. I’ve been researching all day but ...
user avatar
9 votes
9 answers
5k views

Is there an Evolutionary advantage for 10% of my mammalian species from the Homo genus to have Von Willebrand blood-clotting disease?

In my world, there is a species of human called Homo hematophagous (blood eating human). Traditionally, these vampires are a cannibalistic race: In war they often drank the blood from their rivals' ...
17 votes
5 answers
2k views

Would a trait that's genetics have "circular dominance" be plausible?

Okay, so based on some quick research, there don't appear to be any real-life cases in genetics of "circular dominance" where, for example, allele A is dominant to allele B, B is dominant to ...
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0 votes
1 answer
138 views

What gene could have a mutation that makes humans have blubber?

In my world, there are three species from the Homo genus that make together a clade named the aquatic humans: Homo maritimus, Homo corpulentus, and Homo gigas (the names respectively mean "marine ...
2 votes
4 answers
446 views

Is it reasonable to assume the near-extinction of women?

The world of Ruquelis has some problems. It is populated by men, women and winged lilim as in this question: How to get the Lilim to breed true?. People on Ruquelis reincarnate according to the ...
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8 votes
8 answers
2k views

How to get the Lilim to breed true?

On my worlds of Earth, Ruquelis and Ersutiabu, there are three sexes relevant to this question, Men (XY male), Women (XX female) and Lilim (LX female), where X, Y and L are sex chromosomes. Lilim ...
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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
1 answer
137 views

A genetic disease that is characterised by both gigantism and intellectual disability [closed]

In an Of Mice and Men parody I want to write, Of Rats and Women, there is a 30 years old woman named Léonie Petit (her surname is ironic, because petit is a French adjective that means small/little/...
10 votes
5 answers
2k views

How would a sapient eusocial species avoid inbreeding?

I have a sapient species in my setting called "mole-bears". I based their social system on eusocial species, specifically naked mole-rats. Mole-bears are on average around 100 pounds and ...
-4 votes
1 answer
149 views

A genetic disease that makes humans of any origin have epicanthic folds (slanted eyes) [closed]

I imagined for a future film, a 21 years old human of French nationality and citizenship named Thérèse Arielle Huguette Flavie Alexandre (Alexandre can be both a given name and a surname, in this case,...
1 vote
3 answers
299 views

How possible is it for someone to be born without a sex(physically)?

When I say "sexless", I mean that they are born without male or female phenotypic sex. Not identifying or being nonbinary, but Anatomically sexless. Note: This is not to offend anyone who ...
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12 votes
13 answers
4k views

A subtle war between the sexes

In this question, I detail a world with a third human sex, lilim, who have bat-like wings and taloned feet like a bird's. The TL;DR is that lilim give birth to equal numbers of men, women and lilim (...
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5 votes
4 answers
1k views

Is it plausible for only living animals to be valid candidates for cloning?

So in my seting an alternate universe that's 67 million years "behind" ours, T. rex is on the brink of extinction early, with only 1 member left due to extreme overhunting by universe ...
1 vote
2 answers
96 views

How could an animal grow hair overnight?

I am trying to create scientifically accurate werewolves. Of course, werewolves are not really possible, but I am trying to make mine as believable as possible. How could they quickly grow hair/fur in ...
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1 vote
1 answer
100 views

Heterozygote advantage against pork tapeworm

Some heterozygote advantages in humans are: People with sickle-cell trait are resistant to malaria, but people with sickle-cell disease tend to die young. Depending of the source we believe, people ...
-1 votes
4 answers
160 views

Genetic engineering for "natural selection" in a single individual [closed]

Yes, I KNOW that evolution is a process that occurs through many generations via random mutations and natural selection, but in a world where humans have found a cure for aging and have mind backups ...
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3 votes
2 answers
344 views

programing genetic memory (or; the hard way to get your kids to clean their room.)

Is genetic memory in higher life forms real? if so can, in theory, an organism be programed for a specific behavior or set of skills? Ie: if genetic memory is a mechanism that does exist, at what ...
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0 votes
1 answer
259 views

A genetic disease that makes genetically and biologically male humans unable to grow facial hair (the opposite of hirsutism)

In a live-action musical film I want to direct, Le Président et Moi (which means "The President and I") (I want the film to have French as its original language), there is a character named ...
0 votes
1 answer
124 views

What would be the differences between our society and one where almost everyone is half-sisters? [closed]

Imagine a medieval society composed entirely of women, with some small number of machines (let's say 7) which can take material from two women and combines it to create an embryo that's implanted in ...
2 votes
2 answers
188 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? ...
-2 votes
1 answer
134 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
270 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 ...
5 votes
1 answer
73 views

What changes to a humans physical form would occur if society lived inside the Earth?

(Mandatory I am new here, hello, nice to meet some fellow world builders, sorry for any mistakes, yikkity yak and all that) In my "world", it has been 500 years since the majority of human ...
1 vote
1 answer
165 views

A genetic disease that makes humans have much more brown fat than the average human being

I wonder if the disease I invented is realistic or a total fiction. In my story The Transcendence of Adolescence, there is a 17 years old homosexual (or lesbian if you want) transgender woman named ...
4 votes
2 answers
503 views

A genetic disease that makes humans unable to produce adrenaline

I wonder if the disease I invented is realistic or a total fiction. In a white drama/lighthearted tragedy (the opposite of black comedy/dark humour) web-series for a teen audience in mind I want to ...
13 votes
10 answers
2k views

Variable Intelligence Among Dragons

In the land of Dracoriri, there are dragons. There weren't always dragons, once humans were the dominant species, but then magic-an unexplained phenomenon-invaded earth alongside creatures from ...
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-8 votes
1 answer
251 views

Would many parents use In Vitro Gametogenesis and Designer Baby technology to choose to have girls with Complete Androgen insensitivity Syndrome? [closed]

I have been reading about Complete Androgen Insensitivity Syndrome and from what I understood these women have features like being more beautiful and more attractive than the average, lack of periods, ...
6 votes
4 answers
820 views

How does the human body reacts to cells older than its own? [closed]

The question is: If i could replace my arm with the arm of someone older than me, would the fact that the cells in the transplanted arm are older cause any specific reaction? Please handwave all ...
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5 votes
2 answers
89 views

What would a heterozygote advantage against the mutant coronavirus responsible for COVID-19 look like?

Some heterozygote advantages in humans are: People with sickle-cell trait are resistant to malaria, but people with sickle-cell disease tend to die young. Depending of the source we believe, people ...
-1 votes
1 answer
159 views

Harmonizing Lamarckism with Genetics [closed]

Many Science-Fiction worlds, whether or not by design, have their aliens arise by what seems to be a form of Lamarckism. While this is all well and good, these same worlds also make use of a lot of ...
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2 votes
1 answer
167 views

Would many parents use Designer Baby technology to make their children have Asperger Syndrome?

I have Asperger Syndrome and I was thinking if in a future which parents can use Genetic Engineering to choose the characteristics of their offspring many of them would choose their children to have ...
3 votes
2 answers
135 views

Why would a species from the Homo genus have overwhelmingly B negative blood type?

In my story (go to see What evolutionary pressures would lead to Ogres?), there is a massive species from the Homo genus called ogre. They mostly have B negative blood type (I do not mean Rhesus null, ...
-3 votes
2 answers
233 views

Shortest pregnancy length possible using artificial womb technology [closed]

Let's say that genetic engineering can make a baby be born far less than 8 - 9 months and since the artificial womb is a device it would not have the metabolism limitations that a real womb have so ...
1 vote
2 answers
294 views

Genetic Plausibility of All-Male Half Giants and All-Female Witches

So, this problem is kind of a two-in-one; arguably two different issues but very closely related, so I'm posting them as one question. I'm designing a lineup of fantasy races for a roleplaying setting,...
0 votes
3 answers
140 views

What would this character potentially be charged with in this situation? [closed]

In my sci fi short story I'm working on, a company called Generation sometime in the future, develops a viral based treatment for a new kind of cancer that has arisen in young children. Around fifteen ...
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6 votes
2 answers
306 views

What are some specific body parts that would irreversibly fail over time in a cancer-immune, biologically immortal person?

Let's say that you have a person who's, if certainly not immortal in the general sense, biologically immortal, as enumerated in this question - not only do their telomeres never shorten, they're also-...
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6 votes
3 answers
358 views

Near-biological immortality and cancer immunity via repurposing telomeres

TL;DR: I have solved aging and cancer with the power of handwaving and genetic science. All rejoice. Yes, there is a question at the end of this all, but you have to read it for it to make sense. In ...
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