(B) Klinefelter's syndrome is a chromosomal disorder caused by the presence of an additional copy of the $X$ chromosome,resulting in a karyotype of $4

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Male with secondary sexual characters of female

(B) Klinefelter's syndrome is a chromosomal disorder caused by the presence of an additional copy of the $X$ chromosome,resulting in a karyotype of $47, XXY$.Phenotypically,these individuals are males.However,they exhibit some female secondary sexual characteristics,such as breast development (gynecomastia).They are usually sterile and have underdeveloped testes.

Class 12 Biology Principles of Inheritance and Variation Chromosomal disorders

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$A$ man having Klinefelter's syndrome is

A
Intersex with secondary sexual characters on the side of female
B
Male with secondary sexual characters of female
C
Female with secondary sexual characters of male
D
Normal fertile male

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Class 12 Questions

Class 12

Biology Questions

Chapter

Principles of Inheritance and Variation

Subtopic

Chromosomal disorders

Which disorder is caused by the loss of one $X$ chromosome in females?

Medium

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Which disorder is indicated by the following karyotype?

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Due to non-disjunction of chromosomes during spermatogenesis,sperms carry both sex chromosomes $(22A + XY)$ and some sperms do not carry any sex chromosome $(22A + O)$. If these sperms fertilize normal eggs $(22A + X)$,what types of genetic disorders appear among the offspring?

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Absence or excess or abnormal arrangement of one or more chromosomes results in

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Match List-$I$ with List-$II$ and select the correct answer using the codes given below:
List-$I$ (Syndrome) List-$II$ (Chromosomal abnormality)
$(1)$ Patau's syndrome $(A)$ $44 + XXY = 47$
$(2)$ Klinefelter's syndrome $(B)$ $44 + X = 45$
$(3)$ Down's syndrome $(C)$ $46 + 1 = 47$, $13^{th}$ chromosome
$(4)$ Turner's syndrome $(D)$ $46 + 1 = 47$, $21^{st}$ chromosome

List-$I$ (Syndrome)	List-$II$ (Chromosomal abnormality)
$(1)$ Patau's syndrome	$(A)$ $44 + XXY = 47$
$(2)$ Klinefelter's syndrome	$(B)$ $44 + X = 45$
$(3)$ Down's syndrome	$(C)$ $46 + 1 = 47$, $13^{th}$ chromosome
$(4)$ Turner's syndrome	$(D)$ $46 + 1 = 47$, $21^{st}$ chromosome

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