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प्रश्न
Mention the contribution of the scientist given below in the study of chromosome:
Waldeyer
उत्तर
Waldeyer - Coined the term 'chromosomes'.
APPEARS IN
संबंधित प्रश्न
Correct the following statement if there is any mistake:
If there are 46 chromosomes in a cell, there will be 23 chromatin fibres inside the nucleus during interphase.
What are genes?
Fill in the blank
The _______ (s) are surrounded by radiating rays called aster
Answer the following question in your own words.
What is meant by ‘chromosome’?
Choose the correct answer:
In an interphase cell chromosome are as _____________
Choose the correct answer:
Chromosomes appear at equator in ____________
Choose the correct answer:
If after karyokinesis, cytokinesis does not occur, then result would be _____________
What is the importance of meiosis in creating variations?
(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.
Multiple Choice Question:
How many chromosomes are found in a cell of humans?
Complete the following sentence with appropriate word:
The chromosomal theory of inheritance was proposed by ____________in 1902.
Define euploidy.
The centromere is found at the centre of the ______ chromosome.
The thin thread-like structures found in the nucleus of each cell are called ______.
What' does 'P' and 'Q' represent in the following diagram of X and Y chromosomes? Select the correct option representing, its appropriate description.
Identify the TRUE statements with respect to aneuploidy.
- When the chromosome number is not the exact multiple of the haploid set, it is described as aneuploidy.
- Aneuploidy is only addition of one or more chromosome(s) to the total number of chromosomes in a cell.
- Aneuploidy is further classified as hypoploidy and hyperploidy.
In higher unisexual animals, one pair of chromosomes is not identical in two sexes. It is called as ______.
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 ______
Differentiate between X-chromosome and Y-chromosome with reference to –
- length of non-homologous regions
- type as per the position of the centromere
Given below is a set of four term. Choose the odd one and write the category of the remaining term:
