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Introduction:
Scientists study family history using a diagram that traces inheritance of a particular trait through several generations. Such diagrams are called pedigree. A pedigree uses symbols to illustrate the inheritance of trait. By analyzing the pedigree we can predict if the person will suffer from disease or will be a carrier of the disease or will be disease free.
Answer to Problem 7STP
Correct answer :
The correct answer is option C. II3
Explanation of Solution
Explanation/justification for the correct answer:
Option C. II3- The given pedigree illustrates inheritance of a genetic disorder. In this diagram, I1 and I2 are parents who carry the genes for a disease/ disorder. Males are represented by squares and females are represented by circles. One who carries the trait is represented by a half filled square or circle. In this pedigree, II3 is a carrier and has children who do not have disease. Children III1 and III2 are carriers and III3 is does not carry the trait.
Hence this is the correct option.
Explanation for incorrect answer:
Option A. I1- In a pedigree diagram, an unfilled square or circle does not express the trait. A partially filled square or circle does not express the trait but is a carrier of the trait. I1 is a carrier of the disease but one of his children (II1) has the disease.
Hence this is not the correct option.
Option B. II1- II1 suffers from the disease so if he has children they will be either carriers or will have disease.
Hence this is not the correct option.
Option D. III1- III1 is a carrier of the disease and marries III2 who is also a carrier. Therefore, it is quite likely that their children will have disease.
Hence this is not the correct option.
Chapter 11 Solutions
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