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Which of the following is wrong for sex chromosome?

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Which of the following is wrong for sex chromosome?

(a) X chromosome is larger than Y

(b) Female human are homozygous

(c) Y chromosome carries TDF

(d) All genes present on Y chromosome are unique to it

I had been asked this question during an interview for a job.

This intriguing question originated from Sex Determination in Mammals in portion Chromosomes and Sex Determination of Cytogenetics

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Right choice is (d) All genes present on Y chromosome are unique to it

The explanation: There is a homologous region between the X and Y chromosome, and genes in Y chromosome in that area is not unique to it. TDF is another name used for SRC gene that is also located on Y chromosome.

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