EASY
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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 offsprings?

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Important Questions on Principles of Inheritance and Variation

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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
Broad palm with single palm crease is visible in a person suffering from- 
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
Klinefelter's syndrome
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders

Which of the following statements are correct about Klinefelter's Syndrome?

A. This disorder was first described by Langdon Down (1866).

B. Such an individual has overall masculine development. However, the feminine development is also expressed.

C. The affected individual is short statured.

D. Physical, psychomotor and mental development is retarded.

E. Such individuals are sterile.

Choose the correct answer from the options given below: 

HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
A colourblind man marries a woman with normal sight who has no history of colour blindness in her family. What is the probability of their sons being colourblind?
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
A human female with Turner's syndrome
HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
Pick out the correct statements:
(i) Haemophilia is a sex-linked recessive 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.
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders

Match the Column- I with Column - II

  Column - I   Column - II
i Autosomal trisomy p Turner's Syndrome
ii Allosomal trisomy q Mendelian disorder
iii Allosomal Monosomy r Klinefelter's Syndrome
iv Cystic fibrosis s Down's Syndrome
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
People suffering from albinism cannot synthesize:
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
Conditions of a karyotype 2n±1 and 2n±2 are called
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
Which one of the following genotype does NOT represent aneuploidy in human being?
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
In the following human pedigree, the filled symbols represents the affected individuals. Identify the type of given pedigree.


Question Image
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
A disease caused by an autosomal primary non-disjunction is
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
If a colour-blind man marries a woman who is homozygous for normal colour vision, the probability of their son being colour-blind is
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
Which of the following most appropriately describes haemophilia?
HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
Match the human disorders shown in Group I with the biochemical processes in Group II. Choose the correct combination.
 
Group I Group II
P. Phenylketonuria i. Melanin synthesis
Q. Albinism ii. Conversion of Phenylalanine to Tyrosine
R. Homocystinuria iii. Tyrosine degradation
S. Argininemia iv. Methionine metabolism
  v. Urea Synthesis
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders

A woman heterozygous for colour blindness marries a colour-blind man. What would be the ratios of carrier daughters, colour-blind daughters, normal sons, and colour-blind sons in the F1 generation?

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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
Children suffering from phenylketonuria are given food low in phenylalanine and supplemented with tyrosine. This is because they
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
How many number of barr body will be present in female suffering from Turner's syndrome?
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
The genetic disorder in which an individual has an overall masculine development, gynaecomastia and is sterile:
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
An abnormal human baby with 'XXX' sex chromosomes was born due to: