Which of the following conditions correctly describes the manner of determining the sex in the given options?
Show Hint
- Homozygous sex chromosomes (ZZ) determine female sex in birds.
- XO type of chromosomes determine male sex in grasshoppers.
- XO condition in humans determines female sex.
- Homozygous sex chromosomes (XX) produce male in Drosophila.
The Correct Option is B
Solution and Explanation
Top Questions on Principles of Inheritance and Variation
- Assertion (A): A male individual always inherits haemophilia from his mother.
Reason (R): The gene for haemophilia lies on X-chromosome.- CBSE CLASS XII - 2025
- Biology
- Principles of Inheritance and Variation
In a certain population, the frequency of three genotypes is as follows:
Genotypes: PP Pp pp
Frequency: 22% 62% 16%
Choose the option that shows the frequency of P and p alleles correctly:- CBSE CLASS XII - 2025
- Biology
- Principles of Inheritance and Variation
- Which of the following conditions correctly describes the manner of determining the sex in the given options?
- CBSE CLASS XII - 2025
- Biology
- Principles of Inheritance and Variation
Answer the following questions:
(a)
- What is a test cross? How can we find out the zygosity of a plant by the use of test cross?
- Why are human females rarely haemophilic? Explain with the help of a cross. Under what conditions can a haemophilic female be born? How do haemophilic patients suffer?
OR
(b) Name the two events ‘a’ and ‘c’ shown in the diagram below.
- Mention where in the cell these events take place.
- Explain the changes taking place during event ‘b’ and mention why these are needed.
- CBSE CLASS XII - 2025
- Biology
- Principles of Inheritance and Variation
- Assertion (A): Human male is referred to as heterogametic.
Reason (R): The male produces millions of sperms of the same kind.- CBSE CLASS XII - 2025
- Biology
- Principles of Inheritance and Variation
Questions Asked in CBSE CLASS XII exam
(A) Explain the following reactions and write chemical equations involved:
(a) Wolff-Kishner reduction
(b) Etard reaction
(c) Cannizzaro reaction- CBSE CLASS XII - 2025
- Oxidation And Reduction Reactions
Inspired by the success of Chandrayaan-3, the Chief Scientist at ‘Space Rover’ a private research group, decided to send some innovative ideas regarding the mission to the Chief Scientist of Chandrayaan-3. The Chief Scientist at ‘Space Rover’ formed four groups for the same. As it was an intellectual activity of thinking rather than doing, these four groups started interacting with each other and friendships developed. On the basis of their interaction and friendship, some members from each group formed ‘Entertainment Through Reading’ group which showed conformity in terms of their interest. ‘Entertainment Through Reading’ group had no written rules, was unstable in form and scope and had no fixed lines of communication. The members of this group enhanced the morale of each other, enjoyed drinking coffee together, read books, served different issues of their work areas and provided support to each other. Ultimately this group developed some innovative ideas which were sent by ‘Space Rover’ to the Chief Scientist of Chandrayaan-3. Though this group was formed for recreation but it contributed towards fulfillment of organisational objectives.
(a) Identify the function of management. Quoting the lines from the above para, explain the steps of the process of the function of management discussed.
(b) Also explain any two points of importance of the function of management identified in (a).- CBSE CLASS XII - 2025
- Controlling
(a) Identify and explain the function of management discussed in the above para.
(b) Explain any four points of importance of the function identified in (a).- CBSE CLASS XII - 2025
- Organizing
Explain the following factors affecting the working capital requirements of a business:
(i) Credit allowed
(ii) Production cycle
(iii) Availability of raw material- CBSE CLASS XII - 2025
- Financial Management and Financial Market
Explain the following points of significance of principles of management:
(i) Providing managers with useful insights into reality
(ii) Meeting changing environment requirements
(iii) Scientific decisions- CBSE CLASS XII - 2025
- Principles of Management