Q1. Why do we consider tongue rolling as dominant and tongue not rolling as recessive?
What do we do in the case of ear wax type i.e Dry and wet? Which one should we consider dominant and recessive and why?
.
.
.
.
.
please help me guys if you know the answer
Answers
Answer:
Stand in front of a mirror, open your mouth slightly and try to bring the sides of your tongue up towards each other to make a U-shape. If you can do it you are a tongue-roller, along with between 65 and 81% of people, more of them women than men.
If you tried this before, the chances are it was in a biology lesson on genetics at school. I remember sitting on my high stool at the lab bench trying in vain to roll my tongue, while my friends seemed to be able to do it effortlessly. The reason we couldn’t all do it, we were told, is because it is a simple genetic trait. You had either inherited the right variant of the tongue-rolling gene or you hadn’t. And if you hadn’t, you would never be able to do it.
Determined not to beaten at this admittedly pointless skill, I spent idle moments practising. To my surprise, eventually, I could do it. This puzzled me, as a genetically-inherited capability is not something you should be able to learn to do. The reason I could, is that the simple inheritance notion of tongue-rolling is a myth. Still, even today, you can find this theory in biology textbooks.