Understanding Corgi Genetics and Retrogenes

The video explores the genetic basis of corgi's distinctive short legs, attributed to a dominant retrogene derived from the FGF4 gene. This gene causes dwarfism by altering limb growth, a trait selectively bred by humans for its appeal. However, it also links to potential health issues like spinal disease. The video concludes with a promotion for Brilliant.org, encouraging viewers to engage in daily science challenges.

What characteristic feature is most commonly associated with corgi mixes?

• Long tails

• Pointed ears

• Curly fur

• Stumpy legs

What is a retrogene?

• A gene that causes long legs in dogs

• A gene that is always inactive

• A gene that forms when mRNA is converted back into DNA

• A gene that is only found in corgis

Which gene is responsible for the dwarfism seen in corgis?

• TP53

• FGF4

• MYC

• BRCA1

What is the effect of the FGF4 retrogene on dog limbs?

• It causes limbs to grow longer

• It causes limbs to stop growing early

• It has no effect on limb growth

• It causes limbs to grow unevenly

What historical insight does the presence of the FGF4 retrogene provide?

• It was introduced by humans in the last century

• It appeared early in the domestication of dogs

• It appeared recently in dog evolution

• It is unique to modern dog breeds

What health issue is linked to the retrogene responsible for short legs in dogs?

• Kidney disease

• Lung disease

• Spinal disease

• Heart disease

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