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A heterozygous father suffers from an autosomal dominant trait. Which of these statements is true?

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Important Questions on Heredity and Variation

EASY
Biology>Genetics and Evolution>Heredity and Variation>Mendelian Disorders in Humans
Select the correct match.
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.
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?
EASY
Biology>Genetics and Evolution>Heredity and Variation>Mendelian Disorders in Humans
Which of the following occurs due to the presence of autosome linked dominant trait?
MEDIUM
Biology>Genetics and Evolution>Heredity and Variation>Mendelian Disorders in Humans
Name the human disease due to autosomal dominant gene :
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.
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

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

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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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

Choose the correct option for the pedigree analysis given below:

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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.
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

EASY
Biology>Genetics and Evolution>Heredity and Variation>Mendelian Disorders in Humans
Point mutation is caused in which of the following diseases?
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
MEDIUM
Biology>Genetics and Evolution>Heredity and Variation>Mendelian Disorders in Humans
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
MEDIUM
Biology>Genetics and Evolution>Heredity and Variation>Mendelian Disorders in Humans
Which one of the following conditions is not responsible for the presence of deoxygenated blood in the arteries of a newborn?
EASY
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?
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
Which of the following most appropriately describes haemophilia?