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Question
Mention the contribution of the scientist given below in the study of chromosome:
Sutton and Boveri
Solution
Sutton and Boveri - They described chromosomes as physical structures and transmitters of hereditary traits.
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RELATED QUESTIONS
What is the number of chromosomes in the gametes of human beings?
Correct the following statement if there is any mistake:
Genes are specific sequences of bases on a chromosome .
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.
Choose the best option out of the four alternatives a, b, c and d
Question 1:
The number of chromosomes in a certain type of cell division is halved. This kind of cell
division occurs in.
(a) Only testis
(b) Only ovary
(c) Both ovary and testis
(d) All body cells
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 |
Chromosomes are mainly made up of ______.
Choose the correct answer:
Chromosomes number is halved in ____________
Choose the correct answer:
Chromosome is most coiled at (in mitosis) ________________
Mention the contribution of the scientist given below in the study of chromosome:
Balbiani
Choose the correct answer:
Chromosome number of man is _____________
Synthesis phase in the cell cycle is called so for the synthesis of more of
Give Reasons for the following
The meiosis is called reductional division
(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.
Explain the Term Spindle
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Chromosomes are the thickest and shortest in telophase.
Name the following:
The pattern of arrangement of genes along a chromosome.
The loss of one or more chromosomes in ploidy is called ______.
Match the following.
| 1. Autosomes | - | Trisomy 21 |
| 2. Diploid condition | - | 9 : 3 : 3 : 1 |
| 3. Allosome | - | 22 pair of chromosome |
| 4. Down’s syndrome | - | 2n |
| 5. Dihybrid ratio | - | 23rd pair of chromosome |
Normally, genes occur in a pair of chromosome, but genes of X and Y chromosomes shows different gene loci indicating ______.
Define the following term:
Chromatid
