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  4. In which of the following will be observed the webbed neck condition?

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Q. In which of the following will be observed the webbed neck condition?

NTA AbhyasNTA Abhyas 2020Principles of Inheritance and Variation

Solution:

The chromosomal disorder occurs when there is an addition or deletion of the chromosome in the individual. In case of trisomy of the $21^{s t}$ chromosome, Down's syndrome will be observed. Turner's syndrome is a type of chromosomal disorder occurring due to the loss of one X chromosome resulting in the genotype as $44+X \, or \, 44+XO$ .
Such females are characterized by stunted height and webbed-neck. They are sterile as ovaries are rudimentary and lack secondary sexual characteristics.
XXY condition is called Klinefelter's syndrome where an individual has an extra copy of X chromosome.