Questions: The ability to roll the edges of the tongue upward in a U-shape is inherited as a dominant allele at a single gene locus. Which of the following genotypes would produce an individual that can roll their tongue? Multiple Choice TT only tt only Tt only

The ability to roll the edges of the tongue upward in a U-shape is inherited as a dominant allele at a single gene locus. Which of the following genotypes would produce an individual that can roll their tongue? Multiple Choice TT only tt only Tt only
Transcript text: The ability to roll the edges of the tongue upward in a U-shape is inherited as a dominant allele at a single gene locus. Which of the following genotypes would produce an individual that can roll their tongue? Multiple Choice TT only tt only Tt only
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Solution

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The answer is the third one: TT or Tt.

Explanation for each option:

  • TT only: This option is incorrect because while TT individuals can roll their tongue, individuals with the Tt genotype can also roll their tongue due to the presence of the dominant allele T.

  • tt only: This option is incorrect because individuals with the tt genotype have two recessive alleles and cannot roll their tongue.

  • TT or Tt: This option is correct because both genotypes contain at least one dominant allele (T), which is sufficient for the tongue-rolling trait to be expressed.

  • Tt only: This option is incorrect because it excludes TT individuals, who can also roll their tongue due to having two dominant alleles.

In summary, individuals with either the TT or Tt genotype can roll their tongue because the presence of at least one dominant allele (T) is necessary for the trait to be expressed.

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