Some People Can Roll Their Tongues into Tubes and Some

question 19

Multiple Choice

Some people can roll their tongues into tubes and some can't.If a child inherits a rolling allele from one parent and a nonrolling allele from the other,she will be able to roll her tongue.The tongue-rolling allele must therefore be

• A) recessive.
• B) dominant.
• C) polygenetic.
• D) adaptive.

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