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A female has two X chromosomes, one carrying allele for colour blindness and other for Haemophilia, and this female marries to a colourblind man. What is the percentage of offspring to get affected by both disorders?

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Important Questions on Principles of inheritance and Variation

EASY
Biology>Genetics>Principles of inheritance 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>Principles of inheritance 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>Principles of inheritance and Variation>Mendelian Disorders in Humans

A woman heterozygous for colour blindness marries a colour-blind man. What would be the ratios of carrier daughters, colour-blind daughters, normal sons, and colour-blind sons in the F1 generation?

MEDIUM
Biology>Genetics>Principles of inheritance 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
EASY
Biology>Genetics>Principles of inheritance and Variation>Mendelian Disorders in Humans
What is sex-linked inheritance? Discuss how sex-linked gene inheritance occurs in human giving two examples.
MEDIUM
Biology>Genetics>Principles of inheritance 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>Principles of inheritance 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
EASY
Biology>Genetics>Principles of inheritance and Variation>Mendelian Disorders in Humans
Completely sex-linked genes are located on _______.
HARD
Biology>Genetics>Principles of inheritance 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>Principles of inheritance and Variation>Mendelian Disorders in Humans
A woman has X-linked condition on one of her X chromosomes. These chromosomes can be inherited by:
EASY
Biology>Genetics>Principles of inheritance and Variation>Mendelian Disorders in Humans
Identify the odd one among the following disorders:
MEDIUM
Biology>Genetics>Principles of inheritance and Variation>Mendelian Disorders in Humans
Which pair is incorrect ?
EASY
Biology>Genetics>Principles of inheritance and Variation>Mendelian Disorders in Humans
State two reasons why the blood of haemophilia persons clot very slowly or not at all.
EASY
Biology>Genetics>Principles of inheritance and Variation>Mendelian Disorders in Humans
Consider the following pedigree over four generations and mark the correct answer below about the inheritance of haemophilia.

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EASY
Biology>Genetics>Principles of inheritance and Variation>Mendelian Disorders in Humans
Which ONE of the following Mendelian diseases is an example of X-linked recessive disorder?
EASY
Biology>Genetics>Principles of inheritance and Variation>Mendelian Disorders in Humans
A woman (whose father is haemophilic and mother is homozygous normal) married a normal man and had two sons and two daughters. What are the chances of their sons being haemophilic?
EASY
Biology>Genetics>Principles of inheritance and Variation>Mendelian Disorders in Humans
Colour blindness in human beings is
EASY
Biology>Genetics>Principles of inheritance and Variation>Mendelian Disorders in Humans
Which of the following most appropriately describes haemophilia?
EASY
Biology>Genetics>Principles of inheritance 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>Principles of inheritance 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