Sex chromosome, either of a pair of chromosomes that determine whether an individual is male or female. Performance & security by Cloudflare, Please complete the security check to access. Meaning of Chromosomes: Chromosomes are the most important constituents of the nucleus and were first observed by Holfmeister (1848) in pollen mother cell of Tradescantia and called it nuclear […] 3. From the NCERT Exemplar Class 8 Science Unit 8, candidates can understand the level and type of questions that are asked in the exam. Cell division is important for the growth and development of an organism. Number of Chromosomes 3. These and other functions of chromosomes have been elucidated below. You can refer to NCERT Solutions for Class 8 Science Chapter 8 Cell Structure and Functions to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams. Knowing about the chromosome structure and function, we can say that the chromosome shape appears like a butterfly with a centromere in between. ‘Cells are the basic structural units of … structure of chromosome. If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. The sex chromosomes of human beings and other mammals are designated by scientists as X and Y. We know each chromosome is made up of DNA and this DNA by replication gives rise to messenger RNA (mRNA) which carries … 4. For proper growth and function of an organism cell division is necessary. Structure and Functions 2 See answers Brainly User Brainly User Chromosomes are thread-like structures located inside the nucleus of animal and plant cells. Chromosomes vary in number and shape among living things. The Function of Chromosomes. Chromosomes house genes responsible for the inheritance of traits and guidance of life processes. There are 46 chromosomes in a human, 23 pairs. The nucleus contains thread-like structures called chromosomes. Nucleus is separated from cytoplasm by Indeed, MYC oncogene maps to chromosome 8p24. It helps me a lot thank you so much Page No 98: They are made of one DNA molecule and protein. Please enable Cookies and reload the page. People normally have two copies of this chromosome. The properties of chromosomes ensure a precise distribution of DNA (genetic material) to the daughter nuclei during cell division. About 8% of its genes are involved in brain development and function, and about 16% are involved in cancer. Chromosomes carry genes. Therefore, it is absolutely essential that each reproductive cell, ie the ovules and … The lesson covers the complete explanation of class 8 Chapter 8 Cell Structure and Function.Topics covered are cells, discovery of cells, cell shape and size, cell numbers, basic structure of cell, cell organelles and the differences between plant and animal cells. Specialized cells undergo repeated rounds of DNA replication without cell division (endomitosis).Polytene chromosomes form when multiple rounds of replication produce many sister chromatids that are stuck together in parallel.. Polytene chromosomes are found in Drosophila species … These ncert book chapter wise questions and answers are very helpful for CBSE exam. Functions 6. We can see chromosomes clearly during cell division. Therefore, these are of great importance in the determination of the phylogeny and taxonomy of the species. Cell Structure and Function Class 8 Science Chapter 8 as per NCERT Book used in CBSE and other Schools. 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