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प्रश्न
Answer the following question in your own words.
What is meant by ‘chromosome’?
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उत्तर
The structure in the nucleus of cells that carries the hereditary characteristics is called the chromosome. It is made up mainly of nucleic acids and proteins. During cell division chromosomes can be clearly seen under the compound microscope. ‘Genes’ which contain the information about hereditary characteristics in coded form are located on chromosomes. Each species has a specific number of chromosomes.
Each chromosome is made up of DNA and it appears dumbell-shaped midway during cell division. There is a constricted region on each chromosome. It is called the ‘Primary constriction’ or ‘Centromere’. This divides the chromosome into two parts. Each part is called an ‘arm’. The centromere has a specific position in each chromosome.
Organization of chromosome
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संबंधित प्रश्न
State the exact location of the Centromere
What are genes?
Humans have 46 chromosomes. Their sperms and eggs will have ______ chromosomes each.
Choose the correct answer:
Chromosomes number is halved in _____________
Choose the correct answer:
Chromosomes number is halved in ____________
Mention the contribution of the scientist given below in the study of chromosome:
Balbiani
Telocentric chromosomes are ______.
What is the importance of meiosis in creating variations?
State how does meiosis maintains chromosome number in a species.
Identify the stages of meiosven below and label them.
Explain the Term Centrioles
Write the functional activity of the following structure:
Spindle fibers
Name the following:
Cells having a single set of chromosomes.
Name the following:
Pairs of chromosomes, present in human egg cells.
Name the following:
Pair of genes responsible for a particular characteristic.
Complete the following sentence with appropriate word:
The number of chromosomes in humans is ________.
With the help of a neat labelled diagram, describe the structure of chromosome.
Explain the structure of a chromosome.
Generally, the recessive character is expressed only when present in a double recessive condition i.e. homozygous condition. However, a single recessive gene can express itself in human beings when the gene is present on ______
Distinguish between the following pair:
Karyotype and Karyokinesis
