Question

If the ability to roll one’s tongue is dominant (R) and the inability to roll one’s tongue is recessive (r), what would the genotype be for someone who can not roll their tongue? A. RR and rr B. Rr C. Rr and rr D. Rr.

Answer 1

Answer:

The genotype would have to be rr

Explanation:

If there's a dominant gene at all, the person would be able to roll their tongue

ex) Rr or RR

Since the person can't roll their tongue, they have to have 2 recessive (1 from each parent)

ex) rr - 1 from each person (the parents had to either have Rr or rr)

Answer 2

The genotype be for someone who can not roll their tongue would have to be rr.

What is recessive and dominant?

The dominant term is related to the genetic transmission of a trait and is represented, in biology, by a capital letter (A, B or V). While recessive, represented by a lowercase letter (a, b or v), they represent genetic traits transmitted only in the absence of the dominant gene.

The exercise says that for someone not to be able to curl their tongue it must be recessive, that way, it cannot express any dominant gene which makes it only possible to have the gene rr.

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