Home
Class 12
BIOLOGY
An abnormality not due to recessive gene...

An abnormality not due to recessive gene is

A

Phenylketonura

B

Alkaptonura

C

Polydactyly

D

Tay sach's syndrome

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question "An abnormality not due to a recessive gene is," we will analyze the options provided and identify which one represents a dominant genetic disorder. ### Step-by-Step Solution: 1. **Understanding the Question**: The question asks for an abnormality that is not caused by a recessive gene, which implies we are looking for a disorder that is caused by a dominant gene. 2. **Reviewing the Options**: - **Option 1: Phenylketonuria (PKU)**: This is an autosomal recessive disorder caused by a deficiency of the enzyme phenylalanine hydroxylase. Since it is recessive, it is not the correct answer. - **Option 2: Alkaptonuria**: This is also an autosomal recessive disorder characterized by a deficiency of the enzyme oxidase, leading to the accumulation of homogentisic acid. Again, this is not the correct answer as it is recessive. - **Option 3: Polydactyly**: This is an autosomal dominant disorder where individuals have extra fingers or toes. Since it is dominant, this is a potential correct answer. - **Option 4: Tay-Sachs Syndrome**: This is an autosomal recessive disorder caused by a deficiency of the enzyme hexosaminidase A. Therefore, this option is also not correct. 3. **Identifying the Correct Answer**: Among the options, polydactyly is the only disorder that is caused by a dominant gene. Therefore, the correct answer is **Option 3: Polydactyly**. ### Final Answer: The abnormality not due to a recessive gene is **Polydactyly**. ---
Promotional Banner

Topper's Solved these Questions

  • CHROMOSOMAL BASIS OF INHERITANCE

    DINESH PUBLICATION ENGLISH|Exercise Check Your Grasp|57 Videos

  • CHORDATA- PROTOCHORDATA

    DINESH PUBLICATION ENGLISH|Exercise CYG|11 Videos

  • COELENTERATA AND CTENOPHORA (OR CNIDARIA AND ACNIDARIA)

    DINESH PUBLICATION ENGLISH|Exercise CYG|10 Videos

Similar Questions

Explore conceptually related problems

Albinism, the total lack of melanin pigment, it due to a recessive gene a. A normal man and a normal woman both of whom had one albino parent, marry. What is the probaility of them having an albino child ?

Which of the following abnormalities is due to X-linked recessive mutation ?

As: Haemophilia is a sex linked disease R: Haemophilia is due to a recessive gene.

To study any kind of genetic abnormality arising due to change is chromosome number, the karyotype is prepared. Which of the following stages is most suitable to develop a karyotype ?

Assertion :- Most of the X-linked disorders can not be eliminated easily from nature and our gene pool. Reason : X-linked dosorders are due to recessive genes.

Pic out the correct stataments (I) Haemophilia is a sex-linked recessive disease (II) Down's syndrome is due to aneuploidy (III) Phenylketonuria is an autosomal dominant gene disorder (IV) Phenylketonuria is an autosomal recessive gene disorder (V) Sickle-cell anaemia is an X-linked recessive gene disorder

Pick out the correct statement (I) Haemophilia is a sex-linked recessive disease (II) Down's syndrome is due to aneuploidy (III) Phenylketonuria is an autosomal recessive gene disorder lt brgt (IV) Sickle-cell anaemia is an X-linked recessive gene disorder

Pick out the correct statements (A) Haemophilia is a sex-linked recessive disease (B) Down's syndrome is due to aneuploidy (C) Phenylketonuria is an autosmal recessive gene disorder (D) Sickle cell anaemia is a x-linked recessive gene disorder

Pick out the correct statements a. Haemophilia is a sex linked recesive disease b. Down's syndrome is due to aneuploidy c.Phenylketonuria is an autosomal recessive gene disorder d.Sickle cell anaemia is a X-linked recessive gene disorder

Pick out the correct statements: (i) Haemophilia is a sex-linked recissive disease. (ii) Down's syndrome is due to aneuploidy. (iii) Phenylketonuria is an autosomal recessive gene disorder. (iv) Sickle cell anaemia is an X-linked recessive gene disorder.