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प्रश्न
Correct the following statement if there is any mistake:
Genes are specific sequences of bases on a chromosome .
उत्तर
Genes are specific sequences of nucleotides on a chromosome.
APPEARS IN
संबंधित प्रश्न
Give appropriate biological or technical terms for the following :
The condition in which a pair of chromosomes carries similar alleles of a particular character.
Given below is a schematic diagram of a portion of DNA.
- How many strands are shown in the diagram?
- How many nucleotides have been shown in each strand?
- Name the parts numbered 1, 2, 3, 4 and 5 respectively.
- Name the DNA unit constituted by the parts 1, 2, 3 collectively.
Match the events given in column A with the phase in mitotic cell division in column B.
| Column ‘A’ | Column ‘B’ | ||
| 1. | Chromosomes get arranged in a horizontal plane at the equator. |
a. | Anaphase |
| 2. | Daughter chromosomes move to the opposite poles of a spindle |
b. | Prophase |
| 3. | Chromosomes become visible as fine, long threads. |
c. | Telophase |
| 4. | Chromosomes lose their distinctiveness and gradually become transformed into a chromatin network. |
d. | Metaphase |
State the difference between:
Chromosome and chromatid:
During the pairing of chromosomes in meiosis, the ________ chromosomes come to lie side by side.
Write a sentence of the following:
Sheath
Label the lettered parts of the given figure and answer the following questions:
(i) What does this diagram represent?
(ii) What is the importance of'd'?
(iii) What are the 'staining' properties of 'b' and 'c'?
(iv) Who gave the term used for this structure today?
(v) What is a?
(vi) Is 'e' present in all chromosomes?
Give Reasons for the following
Chromosomes are the carriers of heredity.
Multiple Choice Question:
The disappearance of spindle and uncoiling of chromosomes takes place in
Multiple Choice Question:
The period between two successive mitotic divisions is
Name the following:
Pairs of chromosomes, present in human egg cells.
Name the following:
A specific part of a chromosome that determine hereditary characteristics.
Identify the odd one:-
The centromere is found at the centre of the ______ chromosome.
Some of the chromosomes have an elongated knob-like appendages known as telomere.
Define Aneuploidy.
The two non-sister chromatids of a paired chromosome are attached to each other at ______ during the process of crossing over.
Given below is a set of four term. Choose the odd one and write the category of the remaining term:
Rewrite the correct form of the statement by changing the first or last word only:
Duplicated chromosomes remain attached at a point termed as centrosome.
