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प्रश्न
Complete the following sentence with appropriate word:
The number of chromosomes in humans is ________.
उत्तर
The number of chromosomes in humans is pairs/46.
APPEARS IN
संबंधित प्रश्न
Choose the ODD one out from the following terms given and name the CATEGORY to which the others belong
Centrosome.Cell wall, Cell membrane, Large vacuoles
The term “chromosomes” literally means ______.
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 |
Fill in the blank
The _______ (s) are surrounded by radiating rays called aster
During the pairing of chromosomes in meiosis, the ________ chromosomes come to lie side by side.
Identify the stages of meiosven below and label them.
Give Technical Terms
The stage at which synapsis in chromosomes to form bivalents.
Name the following:
Cells having a single set of chromosomes.
Complete the following sentence with appropriate word:
The chromosomal theory of inheritance was proposed by ____________in 1902.
Define euploidy.
Describe the structure of sex chromosomes with the help of labelled diagram.
The number of chromosomes found in human beings is ______.
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 |
The sex of the newborn child is a matter of chance and neither of the parents may be considered responsible for it. What would be the possible fusion of gametes to determine the sex of the child?
Read the following statements and select the correct option.
Statement I: The densely packed transcriptionally active, light staining region of chromatin is known as 'Heterochromatin'.
Statement II: The loosely packed, dark staining transcriptionally inactive region of chromatin is known as 'Euchromatin'.
Small swellings on the surface of the chromosome are called______.
A male gorilla has 48 chromosomes in each of its body cells. How many chromosomes will each of the sperms have?
