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Mutations And Genetic Disorders Free Doubts and Solutions

CBSE - XII Science - Biology - Principles of Inheritance and Variation

sex linked disorders are ? dominant recessive lethal non inherited

Asked by imtiyazmulla68 24th March 2018, 9:51 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

Why are colour blindness and thalassemia categorised as mendelian disorders? 
Write the symptoms of these diseases seen in people suffering from them.

Asked by pksunilnair 12th December 2017, 8:56 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

A non haemophilic couple was informed by their doctor that there is a chance of a haemophilic baby to be born to them.Explain the basis on which the doctor conveyed this information .Give the phenotypes and genotypes of all possible children who could be born to them.

Asked by vasturushi 6th June 2017, 3:16 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

State which Human chromosome has least and maximum no. of genes?

Asked by Smita 3rd October 2015, 10:39 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

The recessive genes located on the X-chromosome in humans are always expressed in females.

Asked by haneesh 2nd February 2015, 7:57 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

(i) How does a chromosomal disorder differ from a Mendelian disorder? (ii)  Name any two chromosomal aberration-associated disorders. (iii)  List the characteristics of disorders mentioned above which help in their diagnosis.

Asked by Topperlearning User 25th June 2014, 12:18 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

Name a disorder, give the karyotype and write the symptoms where a human male suffers as a result of an additional X-chromosome.

Asked by Topperlearning User 16th June 2014, 3:57 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

Study the given pedigree chart and answer the questions which follow:       (a) Is the trait recessive or dominant? (b) Is the trait sex-linked or autosomal? (c) Give the genotypes of the parents in generation I and of their third and fourth child in generation II.

Asked by Topperlearning User 16th June 2014, 3:57 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

Explain how does trisomy of the 21st chromosome occurs in humans. List any four characteristic features in an individual suffering from it.

Asked by Topperlearning User 16th June 2014, 3:57 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

Name the phenomenon which leads to situations like 'XO' abnormality in humans. How do humans with 'XO' abnormality suffer? Explain.  

Asked by Topperlearning User 16th June 2014, 3:57 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

(a) Sickle-cell anaemia in humans is a result of point mutation. Explain. (b) Write the genotypes of both the parents who have produced a sickle-celled anaemic offspring.

Asked by Topperlearning User 16th June 2014, 3:57 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

Define mutation. Name one physical and one chemical mutagen.

Asked by Topperlearning User 16th June 2014, 3:57 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

The egg of an animal contains 10 chromosomes, of which one is an X chromosome. How many autosomes would there be in the karyotype of this animal?

Asked by Topperlearning User 16th June 2014, 3:57 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

A human being suffering from Down's syndrome shows trisomy of 21st chromosome. Mention the cause of this chromosomal abnormality.

Asked by Topperlearning User 16th June 2014, 3:57 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

What is aneuploidy?

Asked by Topperlearning User 16th June 2014, 3:57 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

A haemophilic man marries a normal homozygous woman. What is the probability that their daughter will be haemophilic?  

Asked by Topperlearning User 16th June 2014, 3:57 PM
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CBSE - XII Science - Biology - Principles of Inheritance and Variation

Why is it that the father never passes on the gene for haemophilia to his sons? Explain.    

Asked by Topperlearning User 16th June 2014, 3:57 PM
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