HARD
Earn 100

Down syndrome is the presence of an additional copy of which chromosome number?

50% studentsanswered this correctly

Important Questions on Principles of Inheritance and Variation

EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
Write a short note on Down's syndrome.
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
Write the chromosomal disorder in Down's syndrome and write any three symptoms of it.
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
Write notes on Down's syndrome.
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
Which of the following most appropriately describes haemophilia?
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
Karyotype of Klinefelter syndrome is
HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
Give one example of autosomal genetic disease. What is its reason?
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
Describe the symptoms of Down's syndrome.
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
An abnormal human baby with 'XXX' sex chromosomes was born due to:
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
Name a human genetic disorder due to the following :
An additional X-chromosome in a male
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
What is Down Syndrome? Write its symptoms.
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.
EASY
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:
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
Genetic disorder due to trisomy of chromosome 21 in humans is
HARD
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
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
If a colour-blind man marries a woman who is homozygous for normal colour vision, the probability of their son being colour-blind is
HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
Write differences between Down's syndrome and Klinefelter's syndrome.
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
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
A disease caused by an autosomal primary non-disjunction is