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Question
Give Reasons for the following
The meiosis is called reductional division
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Solution
The meiosis is called reductional cell division since the four daughter cells formed have half the number of chromosomes than the mother cell.
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RELATED QUESTIONS
The term “chromosomes” literally means ______.
The component which is in the nuclei of cells and carries the hereditary characteristics is called ______.
Choose the correct answer:
In an interphase cell chromosome are as _____________
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?
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The term 'chromosome' was coined by ___________
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Telocentric chromosomes are _________________
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The stage when sister chromosomes separate from their paired condition.
Complete the following sentence with appropriate word :
Polytene chromosomes are found in _________ of fly larvae.
Multiple Choice Question:
After mitotic cell division, a female human cell will have
Write the functional activity of the following structure:
Chromosome
Name the following:
Cells having a single set of chromosomes.
Name the following:
Pairs of chromosomes, present in human egg cells.
Column ‘II’ is a list of items related to ideas in Column ‘I’. Match the term in Column ‘II’ with a suitable idea given in Column ‘I’.
| Column I | Column II |
| Genetics | Chromosomes are similar in size and shape. |
| Autosomes | The alternative forms of a gene. |
| Recessive gene | Study of laws of inheritance of characters |
| Allele | A gene that can express only when in a similar pair. |
| Homologous chromosomes | Chromosomes are other than the pair of sex chromosomes. |
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 |
In higher unisexual animals, one pair of chromosomes is not identical in two sexes. It is called as ______.
The female gamete/egg cell of a human cell will have ______.
