MEDIUM
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Attached ear lobes, an autosomal recessive disorder, is depicted in the pedigree chart.
Which option depicts the correct conclusion for the same?
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Important Questions on Principles of Inheritance and Variation
EASY
Point mutation is caused in which of the following diseases?
HARD
In the following human pedigree, the filled symbols represents the affected individuals. Identify the type of given pedigree.
EASY
Which of the following most appropriately describes haemophilia?
EASY
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
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
Statement I : All the three types of allosomal genes - linked, linked and linked are present only in male human being.
Statement II : Only linked and not linked genes are present in female human being.
The correct option among the following is
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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
Identify the odd one among the following disorders:
EASY
Which of the following muscular disorders is inherited?
MEDIUM
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
Statement (S): The heterozygous individuals for sickle-cell anaemia express disease phenotype and also carriers of the disease.
Reason (R): genotype individuals are resistant to severe effects of malaria.
The correct answer is
EASY
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
Which one of the following conditions is not responsible for the presence of deoxygenated blood in the arteries of a newborn
EASY
In an Organism, mutation in a single gene exhibits multiple phenotypic expression. Identify the underlying genetic mechanism in the above instance.
MEDIUM
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
Which ONE of the following Mendelian diseases is an example of -linked recessive disorder?
MEDIUM
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.
Based on this information, the disease is most likely to be:
EASY
Select the correct match.
EASY
Thalassemia and sickle cell anaemia are caused due to a problem in globin molecule synthesis. Select the correct statement.
HARD
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?
