HEREDITY
THE PEDIGREE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A short nose
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A long nose
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A medium nose
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No nose (gasp!)
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Detailed explanation-1: -A Nose for Dominance The dominant gene for noses creates a broad nose, while a recessive gene creates a narrow one.
Detailed explanation-2: -Conclusion: The distribution of nose shape was observed to be genetically determined and follows Mendelian single gene dominant‑recessive pattern with the allele for narrow nose dominant over the allele for broad nose.
Detailed explanation-3: -GLI3, DCHS2 and PAX1 are all genes known to drive cartilage growth-GLI3 gave the strongest signal for controlling the breadth of nostrils, DCHS2 was found to control nose ‘pointiness’ and PAX1 also influences nostril breadth. RUNX2 which drives bone growth was seen to control nose bridge width.
Detailed explanation-4: -The size and shape of your nose may not be genetically inherited from your parents but evolved, at least in part, in response to the local climate conditions, researchers claim. The nose is one of the most distinctive facial features, which also has the important job of conditioning the air that we breathe.