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little hurricane

@atropa--belladonna / atropa--belladonna.tumblr.com

| she/her | demi-girl | danish | infj-t | ♌ |
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curlicuecal

domestication syndrome is one of the coolest findings from recent genetics

Yes!

Basically scientists have found that if you start selecting for people-friendly animals, you see a bunch of hypothetically unrelated traits start showing up in all sorts of mammal species: floppy ears, piebald/patterned coats, etc.

This is true for everything from cows to dogs to rats! One of the coolest long term studies on this has been the Russian fox experiments.

So essentially the science goes like this:

You have two copies of every genes, one from each parent.

We tend to simplify genetics, and say that for every single gene you have it is random,l coin flip which copy you pass on to you offspring. We also tend think of genes as a 1:1 ratio of genes—>traits.

But! This is not quite the case.

Genes have a specific physical location and order relative to each other on your chromosomes, and the chance of genes being inherited together goes up the closer together they are located. This means random, unrelated traits can wind up being more commonly inherited together in specific patterns just because those genes are located close together, and you don’t get that completely random reshuffling of two parent’s traits. Some of them tend to stay “stuck” together.

This is called linkage, and it’s why you often see red hair, pale skin, and freckles together, for example.

The second factor that plays into this is that a lot of times 1 gene affects several different traits (or several different genes affect 1 trait). This means that sometimes you really *can’t* untangle two traits because they have a similar cause. For example, say genes for increased aggression are responsible both for making a spider a better hunter (pro) and making a spider more likely to eat its offspring (con). Because the same gene is the cause of both things, natural selection can’t really untangle them.

Circling back to the redhead/freckles/pale skin example, these traits are affected by a number of different genes, but also one gene in particular: MCR1, a gene that changes how your body responds to hormones promoting melanin production. Again, one gene related to pigment production can affect a BUNCH of different traits. (And also skin cancer risk. Fun!)

Domestication Syndrome in mammals turns out to be due to both linkage and genes affect by multiple traits!

See, when we domestic animals we want them to be friendlier/less aggressive, which normally translates to less FEARFUL.

And it turns out that the same genes involved in adrenal responses and other stress reactions are also involved in melanin, cartilage, and bone production. So when we domesticate animals we get these recurring changes in pigmentation (white patches, piebald costs), floppy ears (cartilage), shorter muzzles and other changes in physical stature (bone growth), etc.

We also wind up selecting for a lot of neotenic genes in general— that is, retention of childhood traits into adulthood. That’s because baby animals tend to have lots of friendly/trusting/biddable/curious traits we are looking for.

And honestly, who can say no to a face like this?

Image

ps, since it was mentioned:

the same genes involved in domestication probably help animals form social groups in general. if you need to get along with and trust strangers you need a decrease in the panic/aggression genes.

cats, for example, probably domesticated themselves when they started living close to each other and to humans to feed off of pests in grain silos.

and yeah, some some recent theories suggest humans may have ‘domesticated’ themselves:

so basically you’re saying that when we breed animals to be friends, they become friend-shaped.

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mistah-oso

purely by accident. 

Excellent

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ladepanda

Reasons why I like tumblr

1. None of my family is on here

2. Barely anyone in my life knows the website even exists.

3. employers won’t ask for my tumblr handle

4. Website doesn’t post a “timeline” with laser-targeted ads about me.

5. Non-algorythmic feed. It lets me read shit in the order it was posted.

6. Can’t see other people’s follower counts. Big and small blogs interact/mix better, no one is idolized.

7. No one, absolutely no one, can manage to make money off us little shits

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svlte

By now, I think most of us are aware of the fires in the Amazon, but is there anything that we can do, especially those of us outside Brazil?

thank you!!! This is actually the first I’ve seen of any petitions or donations for the Amazon, and I’ll definitely be signing

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spacedlexi

if anyone would like to learn a couple tricks for carving pumpkins:

- dont cut out the top to scoop out the seeds, cut out the bottom instead. this way the pumpkin doesnt cave in on itself and lasts longer - sprinkle some cinnamon inside at the top after carving. this way when you put the candle in it smells like pumpkin pie

this is the quality content I wanna see on my dash

- rub the i sides with lemon after you’re done scooping. This will also help preserve the pumpkin

It’s fucking June, at least wait until the fourth of July, you animal.

I’m sorry, I can’t hear you over the sound of me disemboweling this pumpkin.

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katesattic

Halloween is a year-long event and I will not be limited by your perception of time.

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I hope all of you kiddos take your relationships slow. Like I swear you guys, never ever rush a good thing. If it takes months before you kiss, or a decade before you propose, that’s okay. If it’s good for you and right for you, it won’t go away with waiting. If you are full of love and you learn to communicate, both of you can be happy right where you are, and you can take the next step, big or small, together. Revel in your first honeymoon stage, or the time before you meet each other in person. Appreciate all your time apart and time together. Hold on to the time before you’ve seen each other fully, when you’re still forgetting whether he likes dogs or cats, or how many siblings she has. You’ll never get these before-times back once they’re gone, and someday you’ll use them to mark out the stages of your life. Just appreciate every day with the person you love, no matter how it is you love them.

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yall better be just as outraged about this as you were about notre dame

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Thor: This is odd.  Titan used to have 3 moons.  Now it only has 2.

Tony:  Oh, yea, that’s cuz Thanos threw one at me.

Steve:  Say what?

Tony:  Thanos threw a moon at me.

Steve:  I… he… he threw… what happened?

Tony:  It broke.  I didn’t.

Tony: I told him not to do it again.

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catchymemes
Holy shit
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anarchapella

Idk I don’t see anything wrong with this? Like drug tests are bullshit and she was probably doing it to keep her job, and it wasn’t like harming her kids? I don’t think it makes her a bad parent.

I’m gonna punch you in the throat

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