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Chapter 14: Q14-3TYU. (page 292)

A man has six fingers on each hand and six toes on each foot. His wife and their daughter have the normal number of digits. Remember that extra digits are a dominant trait. What fraction of this couple's children would be expected to have extra digits?

Short Answer

Expert verified

The fraction of the couple's children expected to have extra digits is 陆 or half.

The change of occurrence of this trait is 50% since the father only has the dominant trait, not the mother.

Step by step solution

01

Description of polydactyly

The presence of extra fingers in the human body is the condition of polydactyly. It is a hereditary condition that is transferred from the parents to the offspring. This condition mostly occurs in fingers such as the thumb finger, middle finger, and little finger.

02

Description of dominant traits 

The particular distinguishing character belonging to a person is known as a trait. The one copy of the gene present in the chromosome that expresses a particular character is termed as dominant traits.

The dominant traits are predominantly expressed in the individuals. Here in this condition, polydactyly is a dominant condition.

03

Prediction of a fraction to get the condition of polydactyly

The father has the condition of six fingers and six toes, and the mother is in normal condition. The polydactyly condition is a dominant trait in this given condition. The fraction of the couple children expected to have extra digits is 陆.

There is a possibility of 50% to pass this deformity in children since the father possesses the dominant trait and the mother is in normal condition.

Hence, the fraction is 陆 for this given condition of polydactyly.

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Most popular questions from this chapter

You are handed a mystery pea plant with tall stems and axial flowers and asked to determine its genotype as quickly as possible. You know that the allele for tall stems (T) is dominant to that for dwarf stems (t) and that the allele for axial flowers (A) is dominant to that for terminal flowers (a).

(a) Identify all the possible genotypes for your mystery plant.

(b) Describe the one cross you would do, out in your garden, to determine the exact genotype of your mystery plant.

(c) While waiting for the results of your cross, you predict the results for each possible genotype listed in part a. Explain how you do this and why this is not called 鈥減erforming a cross.鈥�

(d) Explain how the results of your cross and your predictions will help you learn the genotype of your mystery plant.

A man with type A blood marries a woman with type B blood. Their child has type O blood. What are the genotypes of these three individuals? What genotypes, and in what frequencies would you expect in future offspring from this marriage?

The pedigree below traces the inheritance of alkaptonuria, a biochemical disorder. Affected individuals, indicated hereby the colored circles and squares, are unable to metabolize a substance called alkapton, which colors the urine and stains body tissues. Does alkaptonuria appear to be caused by a dominant allele or a recessive allele? Fill in the genotypes of the individuals whose genotypes can be deduced. What genotypes are possible for each of the other individuals?

Imagine that you are a genetic counselor, and a couple planning to start a family comes to you for information. Charles was married once before, and he and his first wife had a child with cystic fibrosis. The brother of his current wife, Elaine, died of cystic fibrosis. What is the probability that Charles and Elaine will have a baby with cystic fibrosis? (Neither Charles, Elaine, nor their parents have cystic fibrosis.)

Three characters (flower color, seed color, and pod shape) are considered in a cross between two pea plants: PpYyIi* ppYyii. What fraction of offspring is predicted to be homozygous recessive for at least two of the three characters?
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