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The ability to roll one’s tongue(R) is dominant over non-rolling (r). The ability to taste PTC (T) is dominant over non-taster (t). Suppose a woman who is both homozygous tongue-roller and a non-taster marries a man who is heterozygous tongue-roller and is a PTC- taster, and have three children: a homozygous tongue-roller who is also a PTC- taster, a heterozygous tongue-roller who is also a taster, and a heterozygous tongue-roller who is a non-taster.

a.If these parents would have a bunch of more children so that they had 12 in all, how many of these 12 would you expect to be non-tasters who are homozygous for tongue-rolling?

b.If the first child (the homozygous tongue-roller who is a PTC-taster) marries someone who is heterozygous for both traits, draw the Punnett square that predicts what their children would be.

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Jean Keeling
Jean KeelingLv2
28 Sep 2019
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Related questions

2. The ability to taste the chemical PTC isdetermined by a single gene in humans with the ability to tastegiven by the dominant allele T and inability to taste by therecessive allele t. Suppose two heterozygous tasters (Tt) have alarge family.

a. Predict the proportion of theirchildren who will be tasters and nontasters. Use a Punnett squareto illustrate how you make these predictions.

b. What is the likelihood that theirfirst child will be a taster? What is the likelihood that theirfourth child will be a taster?

c. What is the likelihood that thefirst three children of this couple will be nontasters?

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4) What are the chances of this couple having a child who iscolor-blind?

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1. Saguaro cacti have 2 L-shaped arms and you have one with armsthat are different lengths. Arm length in the cactus is controlledby one gene. Arms of the same length (A) are dominant to arms of adifferent length (a). What is the genotype of our cactus? If youcross our cactus with your neighbor’s cactus which has arms of thesame length and ½ of the offspring have different length arms. Whatis the genotype of the neighbor’s cactus?

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3. A boy, whose parents and grandparents had normal vision is colorblind. What are the genotypes of his mother and his maternalgrandparents? (B = normal vision; bb = color blind)

4. The lubber grasshopper is a very large grasshopper, and is blackwith red and yellow stripes. Assume that red stripes are expressedfrom the homozygous RR genotype, yellow stripes from the homozygousrr genotype and both from the heterozygous Rr genotype. What willbe the phenotypic ration of the F1 generation resulting from across of two grasshoppers, both with red and yellow stripes (Rr xRr)? What would be the genotypic ration of the F1 generation? Whatphenotypes would be produced by crossing a grasshopper with bothcolor stripes and one with only yellow stripes?

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