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Which of the following is a X-linked recessive disorder?

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Important Questions on Principles of inheritance and Variation

EASY
Biology>Genetics>Principles of inheritance and Variation>Sex Linked Inheritance
Point mutation is caused in which of the following diseases?
HARD
Biology>Genetics>Principles of inheritance and Variation>Sex Linked Inheritance
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>Principles of inheritance and Variation>Sex Linked Inheritance
Which of the following most appropriately describes haemophilia?
EASY
Biology>Genetics>Principles of inheritance and Variation>Sex Linked Inheritance
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
HARD
Biology>Genetics>Principles of inheritance and Variation>Sex Linked Inheritance
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>Principles of inheritance and Variation>Sex Linked Inheritance

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

MEDIUM
Biology>Genetics>Principles of inheritance and Variation>Sex Linked Inheritance
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>Principles of inheritance and Variation>Sex Linked Inheritance
Identify the odd one among the following disorders:
EASY
Biology>Genetics>Principles of inheritance and Variation>Sex Linked Inheritance
Which of the following muscular disorders is inherited?
MEDIUM
Biology>Genetics>Principles of inheritance and Variation>Sex Linked Inheritance
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?
EASY
Biology>Genetics>Principles of inheritance and Variation>Sex Linked Inheritance

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>Principles of inheritance and Variation>Sex Linked Inheritance
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?
MEDIUM
Biology>Genetics>Principles of inheritance and Variation>Sex Linked Inheritance
Which one of the following conditions is not responsible for the presence of deoxygenated blood in the arteries of a newborn?
EASY
Biology>Genetics>Principles of inheritance and Variation>Sex Linked Inheritance
In an Organism, mutation in a single gene exhibits multiple phenotypic expression. Identify the underlying genetic mechanism in the above instance.
MEDIUM
Biology>Genetics>Principles of inheritance and Variation>Sex Linked Inheritance
Both male and female have normal vision though their fathers were colour-blind, and mothers did not have any gene for colour blindness. The probability of their daughter becoming colour-blind is
EASY
Biology>Genetics>Principles of inheritance and Variation>Sex Linked Inheritance
Which ONE of the following Mendelian diseases is an example of X-linked recessive disorder?
MEDIUM
Biology>Genetics>Principles of inheritance and Variation>Sex Linked Inheritance

The following family tree traces the occurrence of a rare genetic disease. The filled symbols signify the individuals with the disease, whereas the open symbols signify healthy individuals.

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Based on this information, the disease is most likely to be:

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Biology>Genetics>Principles of inheritance and Variation>Sex Linked Inheritance
Select the correct match.
EASY
Biology>Genetics>Principles of inheritance and Variation>Sex Linked Inheritance
Thalassemia and sickle cell anaemia are caused due to a problem in globin molecule synthesis. Select the correct statement.
HARD
Biology>Genetics>Principles of inheritance and Variation>Sex Linked Inheritance
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?