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Write about sex chromosome...

Write about sex chromosome

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Due to nondisjunction of chromosomes during spermatogensis, some sperms carry both sex chromosomes (22A + XY) and some sperms do not carry any sex chromosome (22A + O). If these sperms fertilise normal eggs (22A + X), what types of genetic disorders respectively appear among the offspring ?

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Chromosome sets of four individuals are given below 44A + XXY, 44A + XO, 45A + XX, 45A + XY. a. How many body chromosomes and sex chromosomes are present in normal male and females? b. Identify and write the names of chromosomal abnormalities in the above listed chromosome sets. c. Down's syndrome is seen in both sexes. Comment.

Assertion : Turner's syndrome is caused due to absence of any one of the X and Y sex chromosome Reason : Such individuals show masculine as well as feminine development.

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