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Question
The mother can roll her tongue (dominant phenotype), but her child cannot (recessive phenotype). The mother's genotype must be _______.
The mother can roll her tongue (dominant phenotype), but her child cannot (recessive phenotype). The mother's genotype must be _______.
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Solution
The correct option is B Tt
The mother can roll her tongue because of the dominant phenotype. The genotype of the mother can be TT or Tt. The child cannot roll the tongue due to the recessive phenotype. The recessive phenotype is due to the genotype tt. The child receives one allele from the mother and one from the father. If the child is homozygous recessive, then one t is received from father and the other from mother. This proves that the mother must be heterozygous dominant Tt for the trait. Thus, the correct answer is option B.
The mother can roll her tongue because of the dominant phenotype. The genotype of the mother can be TT or Tt. The child cannot roll the tongue due to the recessive phenotype. The recessive phenotype is due to the genotype tt. The child receives one allele from the mother and one from the father. If the child is homozygous recessive, then one t is received from father and the other from mother. This proves that the mother must be heterozygous dominant Tt for the trait.
Thus, the correct answer is option B.
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