The ability to roll the edges of the tongue upward in a U-shape is considered to be an inherited trait. The standard assumption is that tongue-rolling is a dominant allele at a single gene locus. Which of the following would cast doubt on this assumption? Select all that apply.A) A student who can roll his tongue has both a mother and father who cannot.B) In a large research study, the majority of tongue-rollers were male.C) A research study with 1,000 participants reports that most non-tongue-rollers can learn to roll their tongues.D) A student who cannot roll his tongue has both a mother and father who can.
What will be an ideal response?
A, B, C
The non-tongue-rollers who learn to roll their tongue and the student who can roll his tongue while his parents cannot are two situations that cast doubt on the heritability issue. The situation in which the majority of tongue rollers are male suggests the inheritance pattern could be sex-linked and recessive. The situation where a student cannot roll his tongue while his parents can is inconclusive.
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