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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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Nestor Rutherford
Nestor RutherfordLv2
28 Sep 2019

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Related questions

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.

1) PKU is an inherited disorder that is caused by two recessive alleles. A couple who plan to have children are concerned because the wife is known to be heterozygous for the gene. The husband is homozygous dominant. What percent of their children are likely to have the PKU problem and need to be placed on a special diet? Show a Punnett square to defend your answer.

2) Huntington's Chorea is a lethal genetic disease of the nervous system caused by a single dominant allele. After a couple has a child, they dis­cover that the husband has Huntington's Chorea. There is no history of the disease in the wife's family. What chance is there that their child will be afflicted? Show a Punnett square to defend your answer.

In this set of questions, you will need to be able to apply inheritance patterns of two different characters/genes. One gene is inherited in a sex-linked pattern, while the other gene is inherited through an autosomal gene.

A sex-linked gene determines a condition called glucose-6-phosphate dehydrogenase deficiency (G6PDHD) and is due to an X-linked recessive allele in humans.

An attached earlobe is dominant to a free earlobe, and is an autosomal gene.

Consider the following family history:

A man with an attached earlobe without G6PDHD marries a woman with G6PDHD with free earlobes.

The man’s father had free earlobes, as did both of the woman’s parents.

Use the family history to make predictions about the couple’s children.

Suppose the couple had a daughter without G6PDHD and attached earlobes. What is the probability that she is heterozygous for both genes genes? [ Select ] ["0", "1", "0.25", "0.5", "0.75"]
What is the probability that any son the couple has will have G6PDHD with free earlobes? [ Select ] ["0", "0.25", "0.5", "0.75", "1"]
What is the probability that any daughter that the couple has will have G6PDHD with attached earlobes? [ Select ] ["0", "0.25", "0.5", "0.75", "1"]
If the couple has a child, what is the probability that it will be a son with attached earlobes?

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