The ability to roll the tongue sideways (A) is dominant over the inability to roll one’s tongue (a). In humans, non-attached earlobes (B) are dominant over attached earlobes (b). Two parents with attached earlobes can roll their tongues. They are both heterozygous for the tongue rolling trait. What is the genotype of the mother? What is the genotype of the father? Whare are the possible gametes from the mother? What are the possible gametes from the father? Draw the Punnett square, and combine the gametes to produce offspring. What is the phenotypic ratio of these offspring?
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