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Principles Of Inheritance And Variation

Question
CBSEENBI12046961
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Given below is a pedigree chart showing the inheritance ofa certain sex-linked trait in humans

The trait traced in the above pedigree chart is

  • dominant X- linked

  • recessive X- linked

  • dominant Y- linked

  • recessive Y- linked

Solution

A.

dominant X- linked

In the given chart, the disease is inherited by female child from his father and none of the male child is affected hence it shows that the disease is X linked. Also in the progeny the disease is expressed phenotypically by female child even if it is carrier, so the disease is dominant. Hence the pattern of disease is X linked dominant.

Some More Questions From Principles of Inheritance and Variation Chapter

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Mention the phenomenon of pleiotropy by giving an example.

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Write down Mendel’s dihybrid Phenotypic ratio 

Who were the rediscoverers of Mendelism ?

What are the real determinants of what an organism will become ?

What is the unique feature of F1 generation ?

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