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Target Exam

CUET

Subject

Biology

Chapter

Principles of Inheritance and Variation

Question:

Match List I with List II :

List I List II
A) Phenylketonuria I) Sex linked recessive disease
B) Down’s Syndrome II) Autosome  recessive disease
C) Turner’s Syndrome  III)  Trisomy of chromosome number 21 
D) Haemophilia  IV) Monosomy of  X chromosome 

Choose the correct answer  from the options given below :

Options:

A-I ,B-III , C-IV, D-II

A-II,B-III , C-IV, D-I

A-II ,B-IV , C-III, D-I

A-III ,B-II , C-IV, D-I

Correct Answer:

A-II,B-III , C-IV, D-I

Explanation:

The correct answer is Option (2) – A-II, B-III , C-IV, D-I

List I List II
A) Phenylketonuria II) Autosome  recessive disease
B) Down’s Syndrome III)  Trisomy of chromosome number 21
C) Turner’s Syndrome  IV) Monosomy of  X chromosome
D) Haemophilia  I) Sex-linked recessive disease

Phenylketonuria is an inborn error of metabolism is inherited as an autosomal recessive trait. The affected individual lacks an enzyme that converts the amino acid phenylalanine into tyrosine.

Down’s Syndrome : The cause of this genetic disorder is the presence of an additional copy of the chromosome number 21 (trisomy of 21).This disorder was first described by Langdon Down (1866). The affected individual is short statured with small round head, furrowed tongue and partially open mouth.

Turner’s Syndrome : Such a disorder is caused due to the absence of one of the X chromosomes, i.e., 45 with XO, Such females are sterile as ovaries are rudimentary besides other features including lack of other secondary sexual characters.

Haemophilia : This is an sex linked recessive disease. It shows its transmission from unaffected carrier female to some of the male progeny. In this disease, a single protein that is a part of the cascade of proteins involved in the clotting of blood is affected. Due to this, in an affected individual a simple cut will result in non-stop bleeding.

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