DECODING DNA

Which parent did you get most DNA from? 10 amazing facts about our genes

Image: Sangharsh Lohakare

Genetics can both fascinate and befuddle us with its complexity, but understanding its mechanisms just might be the key to deciphering the building blocks of our entire existence. From genes that are shared between different species to viruses that insert themselves into our DNA, here are 10 things you—likely—didn’t know about genetics and DNA.

Image: Ganapathy Kumar

We vastly underestimate the amount of DNA we carry around in our cells. If you were to unravel all the DNA molecules in your body and lay them end to end, they would stretch an astonishing 10 billion miles—enough to reach the moon and back over 40 thousand times! However, despite the vast amount of DNA in our bodies, if we were to gather and weigh all of it together, it would surprisingly amount to only around 8 ounces.

Image: Harshad Khandare

Surprisingly, humans share about 50% of their DNA with bananas! But this shouldn’t be too surprising given the fact that all life on Earth evolved from a single organism, roughly 3.5 billion years ago. Every living creature on our planet has the same type of DNA, undergoing almost identical processes in order to live and reproduce.

Image: Pedro Lastra

Certain species, like salamanders and starfish, possess remarkable regenerative abilities, allowing them to regrow lost limbs. Other species like axolotls or jellyfish can even go further, regenerating anything from parts of their brains to crucial internal organs, or even recovering from being cut in half! Understanding the genetic mechanisms behind this ability holds promise for regenerative medicine and even tissue engineering.

Image: Hillshire Farm

Surprisingly, we inherit slightly more DNA from our mother’s side. While everyone receives 50% of DNA from each parent, a small portion of mitochondrial DNA, which is passed down exclusively from mother to child, contributes to this imbalance. Mitochondrial DNA also allows for tracing the ancient relationships of human populations, and for this reason, it is extensively studied in anthropology and evolutionary biology.

Image: Pietro Jeng

Scientists have already successfully stored digital data within DNA molecules, and many believe the technique has potential as a long-term storage solution. Its vast storage capacity and durability make it very attractive to store digital information, but the technology is still in development.

Image: George Prentzas

DNA is sort of a blueprint that determines most of our traits and characteristics, but it is far from having the last say on how particular traits or genes will express themselves. Environmental factors can modify gene expression without changing the underlying DNA sequence, potentially impacting health and development. This is the reason that even identical twins have noticeable differences, like unique fingerprints.

Image: Transly Translation Agency

Studies have shown that certain environmental factors experienced by parents, like exposure to stress or traumatic events, can leave chemical marks on DNA that are passed down to offspring. This phenomenon is called transgenerational epigenetic inheritance, and though it seems to contradict some of the tenets of Darwinian ideas, it is now widely accepted as one of the many mechanisms of genetic inheritance in most living organisms.

Image: Fusion Medical Animation

Rare genetic mutations can give natural immunity to certain diseases. In time, if these genes can be distributed sufficiently within a given population this can even lead to collective immunity. For example, there is a genetic mutation called CCR5-delta 32 that provides natural immunity to the Human Immunodeficiency Virus (HIV) by altering the structure of a specific protein these viruses use to infect cells. Studying these unique phenomena can be promising for developing cures and more effective treatments.

Image: Sangharsh Lohakare

A significant portion of the human genome consists of non-coding DNA, often referred to as "junk" DNA because it does not code for proteins. However, recent research suggests that this non-coding DNA plays important roles in gene regulation and genome stability, challenging the notion of it being just 'junk'.

Image: Belinda Fewings

Horizontal gene transfer is a very weird phenomenon where genetic material is transferred between completely different species, bypassing traditional vertical inheritance from parent to offspring. Although the mechanism behind this process is poorly understood, scientists believe that it played a significant role in the evolution of many organisms. In fact, certain types of viruses force this to happen in order to encode themselves into the DNA of their hosts and reproduce.

Deep roots

11 everyday words with indigenous roots

English is a very welcoming language in the sense that it incorporates terms from many other languages from all over the world. And, as it couldn’t be otherwise, Native American languages have lent many of their words and terms to English speakers. Some traveled through Spanish or French before settling into English, and others arrived directly through early contact and trade, helping shape the way we speak today. Did you know about these 11 terms?

The word "canoe" comes from the Taino term canoa, which was first used by Caribbean islanders long before Europeans arrived. Early explorers adopted it to describe the slim, sturdy boats they saw.

Over time, "canoe" became the standard English word for a small paddled craft. Today it still carries that sense of simplicity and closeness to nature.

The word "barbecue" comes from barbacoa, another Taino term for a wooden frame used for cooking meat over fire. Europeans adopted it and applied it to both the method and the gathering itself.

Today, "barbecue" means everything from a backyard cookout to a regional cooking style. Its origins highlight the deep culinary influence of Native Americans in the nation's current culture.

"Skunk" comes from the Algonquian word squnk, which means "urinating fox" (quite a fitting term, indeed). This was an obvious reference to the animal’s strong defensive spray. Early settlers adopted the term directly.

Since English had no better name for the creature, the Native word stuck. Today, the word skunks is also used as playful slang.

The word "moose" originates from Eastern Abenaki, a part of the Algonquian family, where it meant "he strips off bark." Yes, it described the animal’s habit of tearing bark from trees.

The name entered English quickly because settlers relied on Native knowledge of local fauna. The word remains unchanged because of its accuracy and usefulness.

"Raccoon" comes from the Powhatan word arakun, meaning "he scratches with his hands." It described the animal’s clever, humanlike front paws.

Settlers adopted the term because it captured the creature’s behavior beautifully. Today, the raccoon is used as a household symbol of curiosity, not unlike the animal itself.

The term "chipmunk" most probably comes from the Ojibwe word ajidamoo, which means "one who descends trees headfirst." Early English settlers adapted the sound into today’s form.

Though the spelling changed over time, the lively image of a chipmunk racing down a tree face-first stayed.

The word "caribou" comes from the Mi’kmaq term qalipu, which means "snow shoveler," referring to the animal’s habit of digging through snow for food.

French settlers brought the word into English, keeping its descriptive nature. The name still connects the modern animal to the winter landscapes it belongs to.

"Totem" comes from the Ojibwe word ototeman, which means "kinship group." It described symbols representing clans and shared roots.

English adopted it to describe carved poles and symbolic elements. Though broader in modern usage, it still hints at the original sense of community, identity, and heritage.

"Coyote" comes from the Nahuatl word coyōtl, which was used by Indigenous tribes of central Mexico. Spanish speakers adopted it, and English borrowed later.

The word kept its meaning, and it remains one of the most direct links between the English language and Nahuatl.

The tasty avocado’s name traces to the Nahuatl word ahacatl, which refers to the fruit and to a body part as well. Spanish speakers transformed it into aguacate.

Later on, English speakers adapted it to avocado. While the name sounds contemporary and culinary, it has ancient Native roots.

The last Nahuatl word and also the last word on the list comes from the term xocolātl, which describes a bitter cacao drink that was consumed long before Europeans arrived in America. The name traveled from Spanish to English.

Though the product changed dramatically, the word survived. Today, chocolate is a universal symbol of sweetness, with rich and deeply indigenous roots.