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Given below is a pedigree chart showing the inheritance of a certain sex-linked trait in humans.

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The trait traced in the above pedigree chart is

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Important Questions on Heredity and Variation

MEDIUM
Biology>Genetics and Evolution>Heredity and Variation>Mendelian Disorders in Humans
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>Heredity and Variation>Mendelian Disorders in Humans
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.
HARD
Biology>Genetics and Evolution>Heredity and Variation>Mendelian Disorders in Humans
In the following human pedigree, the filled symbols represents the affected individuals. Identify the type of given pedigree.


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EASY
Biology>Genetics and Evolution>Heredity and Variation>Mendelian Disorders in Humans
Which of the following muscular disorders is inherited?
EASY
Biology>Genetics and Evolution>Heredity and Variation>Mendelian Disorders in Humans
What is sex-linked inheritance? Discuss how sex-linked gene inheritance occurs in human giving two examples.
EASY
Biology>Genetics and Evolution>Heredity and Variation>Mendelian Disorders in Humans
Thalassemia and sickle cell anaemia are caused due to a problem in globin molecule synthesis. Select the correct statement.
HARD
Biology>Genetics and Evolution>Heredity and Variation>Mendelian Disorders in Humans
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>Heredity and Variation>Mendelian Disorders in Humans
In an Organism, mutation in a single gene exhibits multiple phenotypic expression. Identify the underlying genetic mechanism in the above instance.
HARD
Biology>Genetics and Evolution>Heredity and Variation>Mendelian Disorders in Humans
What do you mean by sex linked Inheritance. Mention the cause and symptoms of Turner's syndrome.
MEDIUM
Biology>Genetics and Evolution>Heredity and Variation>Mendelian Disorders in Humans
A woman has X-linked condition on one of her X chromosomes. These chromosomes can be inherited by:
MEDIUM
Biology>Genetics and Evolution>Heredity and Variation>Mendelian Disorders in Humans
A man whose father was colour blind marries a woman who had a colour blind mother and normal father. What percentage of male children of this couple will be colour blind?
MEDIUM
Biology>Genetics and Evolution>Heredity and Variation>Mendelian Disorders in Humans
Which pair is incorrect ?
EASY
Biology>Genetics and Evolution>Heredity and Variation>Mendelian Disorders in Humans
Select the correct match.
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Biology>Genetics and Evolution>Heredity and Variation>Mendelian Disorders in Humans
A couple has two sons and two daughters. Only one son is colour blind and the rest of the siblings are normal. Assuming colour blindness is sex-linked, which ONE of the following would be the phenotype of the parents?
EASY
Biology>Genetics and Evolution>Heredity and Variation>Mendelian Disorders in Humans
Point mutation is caused in which of the following diseases?
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Biology>Genetics and Evolution>Heredity and Variation>Mendelian Disorders in Humans

Statement (S): The heterozygous individuals for sickle-cell anaemia HbAHbS express disease phenotype and also carriers of the disease.

Reason (R): HbAHbS genotype individuals are resistant to severe effects of malaria.

The correct answer is

EASY
Biology>Genetics and Evolution>Heredity and Variation>Mendelian Disorders in Humans
A change of single base pair in the gene for beta globin chain (in human haemoglobin) that results in the change of amino acid residue glutamine to valine which is due to
EASY
Biology>Genetics and Evolution>Heredity and Variation>Mendelian Disorders in Humans
Which of the following most appropriately describes haemophilia?
EASY
Biology>Genetics and Evolution>Heredity and Variation>Mendelian Disorders in Humans

Inheritance of which of the following traits is shown in the given cross?

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MEDIUM
Biology>Genetics and Evolution>Heredity and Variation>Mendelian Disorders in Humans

Statement I : All the three types of allosomal genes - X linked, Y linked and XY linked are present only in male human being.
Statement II : Only X linked and not XY linked genes are present in female human being.

The correct option among the following is