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प्रश्न
What are genes?
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उत्तर
Gene is a structural and functional unit of heredity and variations. Genes are specific sequences
of nucleotides on a chromosome that encode particular proteins which express in the form of
some particular feature of the body. In other words, gene is the DNA segment of the
chromosome and it controls the expression of characteristics
संबंधित प्रश्न
During the pairing of chromosomes in meiosis, the ________ chromosomes come to lie side by side.
Choose the correct answer:
Minimum coiling in chromosome is at ______________
Mention the contribution of the scientist given below in the study of chromosome:
Strasburger
Write a sentence of the following:
Sheath
Write a sentence of the following:
Centromere
Choose the correct answer:
Chromosomes largely consist of _______________
Give a reason for the following:
Gametes must be produced by meiosis for sexual reproduction.
(i) Draw a neat labeled diagram to show the metaphase stage of mitosis in an animal cell having ‘6’ chromosome.
(ii) How many daughter cells are formed at the end of mitosis and at the end of meiosis?
(iii) With reference to cell division explain the following terms:
(Chromatid, Centromere, Haploid).
(iv) Name the type of cell division that occurs during:
1. Growth of shoot 2. Formation of pollen grains.
3. Repair of worn out tissues.
Name the following:
The part of the cell associated with heredity.
Give Technical Terms
The stage when sister chromosomes separate from their paired condition.
Write the functional activity of the following structure:
Chromosome
Name the following:
A specific part of a chromosome that determine hereditary characteristics.
Multiple Choice Question
Chromosomal aberrations are caused by:
Long answer type question.
Describe the different types of chromosomes.
Explain the structure of chromosomes with labelled diagram.
The centromere is found at the centre of the ______ chromosome.
Differentiate between X-chromosome and Y-chromosome with reference to –
- length of non-homologous regions
- type as per the position of the centromere
Small swellings on the surface of the chromosome are called______.
Given below is a set of four term. Choose the odd one and write the category of the remaining term:
