Barr bodies can be best defined as inactive X chromosomes in a female somatic cell. This structure is used to verify whether an individual is genetically female or not. This structure can be characterised as condensed chromatin. It is a chromatin-positive substance.

What is meant by royal jelly?

Royal jelly is a honey bee secretion used in the nutrition of larvae and adult queens. It is secreted from the glands located in the hypopharynx of nurse bees. The royal jelly is fed to all larvae in the colony, regardless of sex or caste. During the process of generating new queens, the worker bees construct special queen cells (small rooms). The larvae present in these cells are fed with copious amounts of royal jelly. This type of feeding triggers the development of queen morphology, including the fully developed ovaries that are needed to lay eggs.

E M B I B E

Zoology Crash Course (Based on Revised Syllabus-2023)>Chapter 4 - Principles of Inheritance and Variation>Exercise>Q 11

EASY

12th Tamil Nadu Board

IMPORTANT

Earn 100

Define Barr body.

Important Questions on Principles of Inheritance and Variation

EASY

12th Tamil Nadu Board

IMPORTANT

Zoology Crash Course (Based on Revised Syllabus-2023)>Chapter 4 - Principles of Inheritance and Variation>Exercise>Q 12

Is Y-linked inheritance sex-linked?

MEDIUM

12th Tamil Nadu Board

IMPORTANT

Zoology Crash Course (Based on Revised Syllabus-2023)>Chapter 4 - Principles of Inheritance and Variation>Exercise>Q 13

In the following pedigree chart, state if the trait is autosomal dominant, autosomal recessive or sex-linked. Give a reason for your answer.

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MEDIUM

12th Tamil Nadu Board

IMPORTANT

Zoology Crash Course (Based on Revised Syllabus-2023)>Chapter 4 - Principles of Inheritance and Variation>Exercise>Q 14

What is a pedigree analysis? Suggest how such an analysis can be useful.

HARD

12th Tamil Nadu Board

IMPORTANT

Zoology Crash Course (Based on Revised Syllabus-2023)>Chapter 4 - Principles of Inheritance and Variation>Exercise>Q 15

The pedigree chart given below shows a particular trait which is absent in parents but present in the next generation irrespective of sexes. Draw your conclusion on the basis of the pedigree.

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