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Principles Of Inheritance And Variation

Question
CBSEENBI12003345
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Barr body is missing in the female suffering from

  • Huntington's disease

  • Tay-sach's disease

  • Klinefelter's syndrome

  • Turner's syndrome.

Solution

D.

Turner's syndrome.

In normal females, number of Barr bodies is one less than the number ofX chromosomes. One Barr body means the female has two X chromosomes. Turner's syndrome (44 + XO) is a genetic disorder that affects only females. In this condition, cells of the affected female possess only one X chromosome, instead of two. Due to the presence of only one X chromosome, no Barr body is present in females suffering from Turner's syndrome

Some More Questions From Principles of Inheritance and Variation Chapter

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What do the symbols square and circle in a pedigree chart indicate ?

Define heterogamy. Give an example.

How many chromosomes are found in human cells ?

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