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If a gene follows a criss-cross pattern of inheritance, it is a

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Important Questions on Inheritance and Variation

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Biology>Genetics and Evolution>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
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Biology>Genetics and Evolution>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.
HARD
Biology>Genetics and Evolution>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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Biology>Genetics and Evolution>Inheritance and Variation>Sex Linked Inheritance
Which of the following muscular disorders is inherited?
HARD
Biology>Genetics and Evolution>Inheritance and Variation>Sex Linked Inheritance
Satish is a colour blind boy. His mother has normal vision but his maternal grandfather is colour blind. His father and maternal grandmother have normal vision. Explain the pattern of inheritance with a suitable chart.
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Biology>Genetics and Evolution>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.
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Biology>Genetics and Evolution>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?
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Biology>Genetics and Evolution>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
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Biology>Genetics and Evolution>Inheritance and Variation>Sex Linked Inheritance
A carrier haemophilic female marries a normal male. What will be the phenotype of progeny? Explain with suitable chart.
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Biology>Genetics and Evolution>Inheritance and Variation>Sex Linked Inheritance
A woman has X-linked condition on one of her X chromosomes. These chromosomes can be inherited by:
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Biology>Genetics and Evolution>Inheritance and Variation>Sex Linked Inheritance
Select the correct match.
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Biology>Genetics and Evolution>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

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Biology>Genetics and Evolution>Inheritance and Variation>Sex Linked Inheritance
Point mutation is caused in which of the following diseases?
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Biology>Genetics and Evolution>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?
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Biology>Genetics and Evolution>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.
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Biology>Genetics and Evolution>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?
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Biology>Genetics and Evolution>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

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Biology>Genetics and Evolution>Inheritance and Variation>Sex Linked Inheritance
Which of the following most appropriately describes haemophilia?
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Biology>Genetics and Evolution>Inheritance and Variation>Sex Linked Inheritance
Which ONE of the following Mendelian diseases is an example of X-linked recessive disorder?
MEDIUM
Biology>Genetics and Evolution>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?