Our feline friends share 90% of homologous genes with us, with dogs it is 82%, 80% with cows, 69% with rats and 67% with mice [1]. Human and chimpanzee DNA is so similar because the two species are so closely related. They both descended from a single ancestor species 6 or 7,000,000 years ago.
These three species look alike in many ways, both in body and behavior. But for a clear understanding of how closely they are related, scientists compare their DNA, an essential molecule that's the instruction manual for building each species. Humans and chimps share a surprising 98.8 percent of their DNA.
Cats and humans share 90% of their DNA
You may have thought that dogs would be a little closer to humans on the evolutionary scale, but it turns out that cats actually have 90.2% of the DNA in common with us!
Human and cat genomes each have about 20,000 protein-encoding genes, of which nearly 16,000 are nearly identical between them and us. That correspondence reflects descent from a shared mammalian ancestor from which all cats and humans diverged about 65 million years ago.
Cats have genomes that are structured in much the same way that humans' are, and an article published this week in the journal Trends in Genetics argues this unique quality has been underutilized by scientists who have more commonly studied mice and dogs, reports Katherine J.
Cats do often treat humans like other felines, using gestures like licking or rubbing on both feline friends and human caregivers, she says. “In a way, cats think of us as bigger cats,” Bonk says. “They might not necessarily know that we're a different species or they just don't care.”
Cats don't just think of their owners as food machines. They actually see us as parents. A 2019 study revealed that cats have the same attachment to their owners that babies show to their parents. Kittens in the study acted distressed when their caregivers left and happy and secure when they returned.
Our feline friends share 90% of homologous genes with us, with dogs it is 82%, 80% with cows, 69% with rats and 67% with mice [1]. Human and chimpanzee DNA is so similar because the two species are so closely related. They both descended from a single ancestor species 6 or 7,000,000 years ago.
And, it turns out; the fish are a lot like people. Humans and zebrafish share 70 percent of the same genes and 84 percent of human genes known to be associated with human disease have a counterpart in zebrafish.
About 60 percent of chicken genes correspond to a similar human gene. However, researchers uncovered more small sequence differences between corresponding pairs of chicken and human genes, which are 75 percent identical on average, than between rodent and human gene pairs, which are 88 percent identical on average.
All human beings are 99.9 percent identical in their genetic makeup. Differences in the remaining 0.1 percent hold important clues about the causes of diseases.
Ever since researchers sequenced the chimp genome in 2005, they have known that humans share about 99% of our DNA with chimpanzees, making them our closest living relatives.
Cows and humans do indeed share 80% of their DNA, the building block of all life on earth, according to this 2009 study in the journal Science. But humans are genetically closer to a host of species than they are to cows, including cats, dogs, horses, and our closest relatives, apes.
For the first time ever, a group of researchers has sequenced the genome of the spider. This knowledge provides a much more qualified basis for studying features of the spider. It also shows that humans share certain genomic similarities with spiders.
Chimpanzees are our closest relative as a species and we share at least 98% of our genome with them. Our feline friends share 90% of homologous genes with us, with dogs it is 82%, 80% with cows, 69% with rats and 67% with mice [1]. Human and chimpanzee DNA is so similar because the two species are so closely related.
The percentage of genetic similarities between humans and animals does vary: chimps, 97% similar; cats, 90%; cows, 80%; mice, 75%; fruit flies, 60%, and jellyfish, 60%.
Some 450 million years ago, sharks and humans shared a common ancestor, making sharks our distant cousins. And according to recent research, this kinship is evident in our DNA, as at least one shark species possesses several genes that are nearly identical to those in humans.
Scientists have now completed a draft sequence of the frog Xenopus tropicalis and found that the amphibian's genome contains remarkable similarities to those of the mouse, the chicken and, yes, even the human genome.
We do in fact share about 50% of our genes with plants – including bananas.” “Bananas have 44.1% of genetic makeup in common with humans.”
The recent sequencing of the gorilla, chimpanzee and bonobo genomes confirms that supposition and provides a clearer view of how we are connected: chimps and bonobos in particular take pride of place as our nearest living relatives, sharing approximately 99 percent of our DNA, with gorillas trailing at 98 percent.
The genetic DNA similarity between pigs and human beings is 98%. Interspecies organ transplant activities between humans and pigs have even taken place, called xenotransplants.
However, our kitties are still related to the big cats — especially tigers, the largest of the world's big cats and one of the most fear-inspiring predators. A study published in 2013 found that our pet cats share 95.6 percent of their genome (DNA) with the Amur tiger.
Sleeping near you
If your kitty likes to sleep near you - or even on you - this is an indication that they have total trust in you.
After several years, they can still remember people, places and events from the past. So maybe next time you find your cat staring blankly at a wall or closet, it may be possible that she is thinking of the past and replaying it over and over again.
Cats can also discriminate between familiar and unfamiliar humans, recognise human faces and voices, and make the mental match between the two.