With the help of one example explain the phenomenon of codominance and multiple allelism in human population.

Important Questions on Principles of Inheritance and Variations

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 18

Write the Scientific name of the fruit fly. Why did Morgan prefer to work with fruit flies for his experiments? State any three reasons.

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 19

Linkage and crossing over of genes are alternatives of each other. Justify with the help of an example.

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 20

In Snapdragon, a cross between true-breeding red-flowered (RR) plants and true-breeding white-flowered (rr) plants showed a progeny of plants with all pink flowers.
The appearance of pink flowers is not known as blending. Why?

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 20

In Snapdragon, a cross between true-breeding red-flowered (RR) plants and true-breeding white-flowered (rr) plants showed a progeny of plants with all pink flowers,
What is this phenomenon known as?

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 21

Differentiate between male and female heterogamety?

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 22

Explain the mechanism of sex determination in birds.

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 23

Differentiate between ZZ and XY type of sex determination mechanism.

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 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.