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प्रश्न
Explain the Term Zygotene
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उत्तर
Zygotene: Pairing of homologous chromosomes (synapsis) occur in this stage. Each pair is bivalent.
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संबंधित प्रश्न
Synthesis phase in the cell cycle is called so, because of the synthesis of more:
A. RNA
B. RNA and proteins
C. DNA
D. Glucose
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 |
Choose the correct answer:
Chromosome is most coiled at (in mitosis) ________________
Choose the correct answer:
Telocentric chromosomes are _________________
What is the importance of meiosis in creating variations?
Give a reason for the following:
Gametes must be produced by meiosis for sexual reproduction.
Name the following:
The part of the cell associated with heredity.
Give Reason:
The Law of independent assortment holds good for the gene pairs that occur in different pairs of chromosomes.
Name the following:
Cells having a single set of chromosomes.
Name the following:
Pairs of chromosomes, present in human egg cells.
Name the following:
Pair of genes responsible for a particular characteristic.
Complete the following sentence with appropriate word:
The chromosomal theory of inheritance was proposed by ____________in 1902.
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. |
Long answer type question.
Describe the different types of chromosomes.
Explain the structure of chromosomes with labelled diagram.
The thin thread-like structures found in the nucleus of each cell are called ______.
______ is a sudden permanent heritable change that can occur in the gene, in the chromosome or chromosome number.
Which of the following is TRUE with respect to the genes which inherit together during crossing over?
