Home
Class 12
BIOLOGY
Assertion : Turner's syndrome is caused ...

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.

A

A and R both are correct and R is correct explanation of A

B

A and R both are correct and R is not the correct explanation of A

C

A is correct and R is incorrect

D

A and R both are incorrect

Text Solution

AI Generated Solution

The correct Answer is:
### Step-by-Step Solution: 1. **Understanding Turner Syndrome**: - Turner syndrome is a chromosomal disorder that affects females. It is characterized by the absence of one of the X chromosomes, leading to a 45,X karyotype instead of the normal 46,XX karyotype found in typical females. 2. **Analyzing the Assertion**: - The assertion states that Turner syndrome is caused by the absence of any one of the X and Y sex chromosomes. This is incorrect. Turner syndrome specifically results from the absence of one X chromosome (45,X), not from the absence of a Y chromosome. 3. **Analyzing the Reason**: - The reason given is that individuals with Turner syndrome show masculine as well as feminine development. This is also incorrect. Individuals with Turner syndrome typically do not exhibit masculine traits; instead, they have female characteristics but may have underdeveloped secondary sexual characteristics and are usually sterile. 4. **Conclusion**: - Both the assertion and the reason are false. Therefore, the correct answer to the question is that both the assertion and reason are incorrect. ### Final Answer: Both the assertion and reason are false. ---
### Step-by-Step Solution: 1. **Understanding Turner Syndrome**: - Turner syndrome is a chromosomal disorder that affects females. It is characterized by the absence of one of the X chromosomes, leading to a 45,X karyotype instead of the normal 46,XX karyotype found in typical females. 2. **Analyzing the Assertion**: - The assertion states that Turner syndrome is caused by the absence of any one of the X and Y sex chromosomes. This is incorrect. Turner syndrome specifically results from the absence of one X chromosome (45,X), not from the absence of a Y chromosome. ...
Promotional Banner

Topper's Solved these Questions

  • PRINCIPLES OF INHERITANCE & VARIATION

    NCERT FINGERTIPS ENGLISH|Exercise Principles Of Inheritance & Variation|167 Videos

  • PRINCIPLES OF INHERITANCE & VARIATION

    NCERT FINGERTIPS ENGLISH|Exercise EXEMPLAR|17 Videos

  • PRACTICE PAPERS

    NCERT FINGERTIPS ENGLISH|Exercise Practice paper|150 Videos

  • REPRODUCTION IN ORGANISM

    NCERT FINGERTIPS ENGLISH|Exercise All Questions|137 Videos

Similar Questions

Explore conceptually related problems

Name the disorder caused due to the absence of one of the X-chromosomes in a human female.

Absence of one sex chromosome causes

Assertion: The Y-chromosome is called androsome. Reason: X and Y-chromosomes differ in form and size.

Assertion : Down syndrome, Klinfelter syndrome and Turner syndrome are chromosomal disorders. Reason : In Klinfelter syndrome females are sterile.

State True of False (i) Hetrozygous female for haemophilia may transmit the disease to sons (ii) Affected individuals with phenylketonuna lack an enzyme that converts the amino acid phenylalanine into phenylpyruvic acid (iii) Klinefelter's syndrome is caused due to the presence of an additional copy of X-chromosome resulting into a karyotype of 47//XXX (iv) Failure of segregation of homologous pair of chromosomes during cell division cyclic results in Turner's syndrome.

Assertion :- Gynaecomastia is observed in Turner's syndrome. reason :- Such a disorder is caused due to the presence of extra copy of X-chromosome.

Assertion:There are more colour blind men than woman throughout the world Reason : Colour blindness is a sex-linked disease resulting from a recessive gene on the Y chromosomes.

Assertion : When the DNA sequences of two people are cut using the same restriction enzyme, the length and number of fragments obtained are different for both. Reason : DNA sequence is arranged tandemly in many copy numbers which varies from chromosome to chromosome in an individual, showing high degree of polymorphism.

Assertion: Natural selection is the outcome of differences in survival and reproduction among individuals that show variation in one or more traits. Reason: Adaptive form of a given trait tend to become more common, less adaptive ones become less common or disappear.