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प्रश्न
Give Technical Terms
The stage at which the formation of chiasmata occurs.
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उत्तर
Pachytene
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संबंधित प्रश्न
Name the sex chromosomes in human males and females
Name the following:
The number of chromosomes present in a nerve cell of a human being.
The term “chromosomes” literally means ______.
Fill in the blank
The _______ (s) are surrounded by radiating rays called aster
Mention whether the following statement is (T) Or (F). Give reason in support of your answer.
The unfertilized human egg has half the number of chromosomes of the body cells.
Choose the correct answer:
Chromosomes appear at equator in ____________
Choose the correct answer:
Chromosomes number is halved in _____________
Write a sentence of the following:
Sheath
Draw a duplicate chromosome and label its part.
Name the following:
The part of the cell associated with heredity.
Complete the following sentence with appropriate word :
The pairing of homologous chromosomes is called _______.
Write the functional activity of the following structure:
Spindle fibers
Give Technical Term:
Transmission of characters through generations.
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 |
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
