(D) Turner's syndrome is a genetic disorder caused by the absence of one $X$ chromosome in human females. The genotype of an individual with Turner's

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(D) Turner's syndrome is a genetic disorder caused by the absence of one $X$ chromosome in human females. The genotype of an individual with Turner's syndrome is $45, XO$ (or $44 + XO$). This condition is classified as a sex-chromosomal abnormality because it involves the loss of an entire sex chromosome,leading to a total of $45$ chromosomes instead of the normal $46$.

Class 12 Biology Principles of Inheritance and Variation Chromosomal disorders

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The cause of Turner's syndrome in humans is:

A
Incomplete sex linkage
B
Sex-linked inheritance
C
Autosomal abnormality
D
Sex-chromosomal abnormality

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Class 12 Questions

Class 12

Biology Questions

Chapter

Principles of Inheritance and Variation

Subtopic

Chromosomal disorders

The condition of sex chromosomes in a male child with Down's syndrome will be:

MediumAIPMT 1991

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Broad palm with single palm crease is visible in a person suffering from-

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The mechanism that causes a gene to move from one linkage group to another is called

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Which of the following characteristics is common in plants?

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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 $(C)$ $46 + 1 = 47$,Chromosome $13^{th}$
$(4)$ Turner's syndrome $(D)$ $46 + 1 = 47$,Chromosome $21^{st}$

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	$(C)$ $46 + 1 = 47$,Chromosome $13^{th}$
$(4)$ Turner's syndrome	$(D)$ $46 + 1 = 47$,Chromosome $21^{st}$

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