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Male children born to a colour blind mother and a normal father is

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Important Questions on Principles of Inheritance and Variation

EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
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 and Evolution>Principles of Inheritance and Variation>Genetic Disorders
Which of the following muscular disorders is inherited?
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
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 and Evolution>Principles of Inheritance and Variation>Genetic Disorders
If a colorblind woman marries a normal visioned man, their sons will be:
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
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 and Evolution>Principles of Inheritance and Variation>Genetic Disorders
Which of the following is not a Mendelian disorder?
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
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?
HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
A haemophilic man marries a woman whose mother was normal but her father was haemophilic. What percentage of childern would be there to be haemophilic. Explain it with necessary crossing.
HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
Match the human disorders shown in Group I with the biochemical processes in Group II. Choose the correct combination.
 
Group I Group II
P. Phenylketonuria i. Melanin synthesis
Q. Albinism ii. Conversion of Phenylalanine to Tyrosine
R. Homocystinuria iii. Tyrosine degradation
S. Argininemia iv. Methionine metabolism
  v. Urea Synthesis
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders

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 and Evolution>Principles of Inheritance and Variation>Genetic Disorders
What will be the percentage of affected son, whose father is colour-blind and mother is normal?
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders

Fill in the blank with the most appropriate option given below.

We should give everyone training in citizenship, but we have______this aspect till now.

EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
State two reasons why the blood of haemophilia persons clot very slowly or not at all.
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders

Select the correct option for the given statements.

Statements.

X = Father is colour blind

Y = His daughter can be colour blind or carrier for colour blindness.

HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders

Correct the following statement, if there is any mistake:

Haemophilia is an autosome linked recessive disease.

HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
What is sex-linked inheritance? Describe the inheritance of haemophilia.
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
"Man is unable to pass on the sex-linked gene to son." Justify the statement. 
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
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>Principles of Inheritance and Variation>Genetic Disorders
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?
HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Genetic Disorders
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.