Concept explainers
(a)
To explain: The reason that Beth’s brother is albino although her parents are not albino.
(a)
Answer to Problem 121E
Solution: The child will be an albino
Explanation of Solution
Alleles inherited from Parent |
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Alleles |
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Alleles inherited from Parent. |
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Alleles inherited from Parent. |
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Alleles |
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Alleles inherited from Parent. |
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Alleles inherited from Parent. |
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Alleles |
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Alleles inherited from Parent. |
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With both the parents as non-albino, that is, genes
(b)
The genetic type of Beth’s parents’ child.
(b)
Answer to Problem 121E
Solution: Beth’s parents’ child could have the genetic type as
Explanation of Solution
Alleles inherited from Parent. |
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Alleles |
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Alleles inherited from Parent. |
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Therefore, Beth’s parents’ child could have either of the set of genes
To find: Probability of each type of genes inherited by the offspring.
Answer to Problem 121E
Solution: The probabilities for each set of genes are:
Explanation of Solution
Calculation: It is provided in the question that the inheritance of the alleles by the child is an independent event. The probability for each of them is 0.5. Thus, the probabilities can be written as follows:
And
The probabilities for each set of genes inherited can be calculated as follows:
Hence, the obtained probabilities are
(c)
To find: The conditional probabilities for Beth’s genetic type provided the fact that Beth is nonalbino.
(c)
Answer to Problem 121E
Solution: The conditional probabilities obtained are:
Explanation of Solution
Calculation: The possible cases for types of genes of Beth based on the genes inherited from her parents are presented in the form of table in part (b) as follows:
Alleles inherited from Parent. |
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Alleles |
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Alleles inherited from Parent. |
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Since, it is provided that Beth is not albino, therefore, the possible genetic types of Beth are either
And
Hence, the obtained probabilities are:
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Chapter 4 Solutions
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