From 1966 until 1990 Olympic women athletes were tested for the presence of Barr

Question

From 1966 until 1990 Olympic women athletes were tested for the presence of Barr bodies in their cheek epithelial cells. Which of the following rationales did the Olympic organization use to disqualify women athletes who failed the Barr body test because they were considered genotypic males? Select one: Barr bodies are condensed X chromosomes present in somatic cells of females. The absence of Barr bodies indicates a genotypic male. Barr bodies are present on the Y chromosome in males. The presence of Barr bodies indicates a genotype male. Barr bodies are present on the Y chromosome in males. The absence of Barr bodies indicates a genotypic male. Barr bodies are condensed X chromosomes present in somatic cells of females. The presence of Barr bodies indicates a genotypic male.

Explanation / Answer

Barr bodies are inactive X chromosome, which is found only in somatic cells of female.Thus they are absent in males. The Barr bodies are also known as Sex chromatin as it indicates the presence of Sex hormones.

The Barr bodies tset is used to differentiate between male and female, as it is regarded as diagnostic for genetic femaleness.

Now, coming to the answer -

You can rule out 2 and 3 option as Barr bodies are absent in males.

The option 4 is also incorrect. Barr bodies are condensed X chromosome present in somatic cell of females but it doesnt indicates the genotypic male. Thus, option 4 indeed is incorrect.

The correct option is (1) - given below

Barr bodies are condensed X chromosomes present in somatic cells of females. The absence of Barr bodies indicates a genotypic male.

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