Haemophilia is a sex-linked recessive disorder of humans. The pedigree chart given below shows the inheritance of haemophilia in one family. Study the pattern of inheritance and answer the questions given. A blood test shows that the individual 14 is carrier of haemophilia. The member numbered 5 has recently married the member numbered 14. What is the probability that their first child will be a haemophilic male?

Given that 14 is the carrier for haemophilia. It means that she has one normal allele and one allele of haemophilia. So the genotype of 14 is X H X h and 5 is X h Y. Out of four children, one child is haemophilic male. So, the probability that their first child will be a haemophilic male is 1/4.

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12th CBSE

IMPORTANT

Earn 100

Explain the mechanism of sex determination in birds.

Important Questions on Principles of Inheritance and Variations

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12th CBSE

IMPORTANT

TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 5 - Principles of Inheritance and Variations>TEST QUESTIONS>Q 23

Differentiate between ZZ and XY type of sex determination mechanism.

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12th CBSE

IMPORTANT

TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 5 - Principles of Inheritance and Variations>TEST QUESTIONS>Q 1

Haemophilia is a sex-linked recessive disorder of humans. The pedigree chart given below shows the inheritance of haemophilia in one family. Study the pattern of inheritance and answer the questions given.

Question Image
Give all the possible genotypes of the members 4, 5 and 6 in the pedigree chart.

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12th CBSE

IMPORTANT

TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 5 - Principles of Inheritance and Variations>TEST QUESTIONS>Q 1

Question Image
A blood test shows that the individual 14 is carrier of haemophilia. The member numbered 5 has recently married the member numbered 14. What is the probability that their first child will be a haemophilic male?

MEDIUM

12th CBSE

IMPORTANT

TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 5 - Principles of Inheritance and Variations>TEST QUESTIONS>Q 2

The inheritance pattern of ABO blood groups in humans shows dominance, co-dominance and multiple allelism. Explain each concept with the help of blood group genotypes.

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12th CBSE

IMPORTANT

TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 5 - Principles of Inheritance and Variations>TEST QUESTIONS>Q 3

Recently a girl baby has been reported to suffer from Haemophilia. How is it possible. Explain with the help of a cross.

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12th CBSE

IMPORTANT

TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 5 - Principles of Inheritance and Variations>TEST QUESTIONS>Q 4

In one family, each of four the children has a different blood group. Explain with the help of cross.

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12th CBSE