Science

Why is there a difference in the height of dogs?

Why is there a difference in the height of dogs?

From the Great Dane to Chechwahwaz, dogs are found in much different height, height and size. In fact, the transformation in their body is the greatest than any other world. If there is such a change in humans, the tallest person may be higher than six meters. It was often thought that the difference was caused by ‘selective breeding’ or specific breeding breeds by humans over the past two centuries.
But now scientists have discovered that there is also a lot of nature’s involvement. A new study suggests that the main reason for this change in dogs’ height is the presence of wolf’s DNA which is 50 Lived here a thousand years ago It was long before humans started rearing grey wolves, genetic evidence suggests dogs were separated from their ancestors 15 thousand to 40 thousand years ago.
The ‘mysterious’ gene of genes of genes in dogs.
Dr. Ellen Ostrender, the main author of genetics and new research at the US-based National Human Genome Research Institute, says ‘It was a great surprise to all of us that there was a genetic variant among live wolves so long ago with a short height. ‘It was attached.’
This new research was published on January 27 in the scientific journal current biology.
She says “It’s like nature kept her in her back pocket for thousands of years until she really needed it.”
A small number of chains in the height of dogs than humans controls a small number of chains
Ostrender and his team were also behind research that discovered in 2007 that a single gene plays a major role in determining the size gap between dogs. This gene, IGF-1, is responsible for a protein, including humans.
Mammals also play a role in body size.
However, the role of IGF-1 is more prominent when it comes to dogs. Scientists say the protein-making genes control about 15 percent of dog size, while the rest of the 19 genes control.
“There is a huge difference between dogs in terms of body size, says Dr Jocelyn Plasese, a genetics expert at Rennes University in France. Hundreds of genes play a role in humans, for example. ‘Does it.’
How much does it change in dogs?
According to the Guinness Book of World Records, the largest dog in the world was a Great Dean named Zeus and was 111 cm tall from the ground to the shoulders. In comparison to him, a chihuahua dog in China, Merkel Milli was taller than him. Was 12 times smaller i.e. 9.65 cm.
There is no much difference between humans. American man Robert Weedlow was 272 cm tall and was five times bigger than his opponent Nepal’s Chandra Dangi. Chandra was 54.6 cm tall.
A surprise from the past
Plases has played a key role in this new research. During the first COVID-19 lockdown in 2020, they discovered that there are two types of IGF-1 gene that play a role in determining size: one associated with small animals And from the other big animals.
Researchers analyzed the genetic codes of a thousand 431 candies (different breeds of dogs) from ancient dogs and wolves to modern dogs, foxes, coyotes and wolves.
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They found that 75 per cent of pet dogs weighing less than 13 kg had two copies of the “smaller” types and 75 per cent of samples weighing more than 22 kg had two copies.
But what influenced Ostrander and Placis most was what they saw in the DNA of a wolf that lived on Earth 52 thousand 500 years ago: every animal (dog) had a kind of copy of that gene.
Researchers were surprised to see this when they saw a smaller variant in the DNA of a wolf that lived on the ground 52 thousand years ago
Ostrender says we expected there would be two ‘large’ copies.
But geneticists say the presence of the variant helped humans through the early stages of dog breeding thousands of years ago.
She says it made humans, dog sizes bigger and smaller so that they could breed a variety of jobs, including guard dogs carrying the herd to hunting dogs. Be able to.
Ostrender also noted that studying dogs could help solve human problems. She says it’s ‘very important to understand this genetic dictionary because we often see body-sized jeans change when some changes Humans are infected with diseases.

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