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प्रश्न
Differentiate between
Gametic meiosis and Zygotic meiosis.
उत्तर
| Gametic meiosis | Zygotic meiosis |
| When the reproductive cells of a diploid organism undergoes meiosis to produce haploid gametes, it is called gametic meiosis. | Some algae and fungi are haploid adults. They produce haploid gametes which upon fertilization form a diploid zygote. This‘zygote undergoes meiosis to form haploid spores, which on repeated mitotic division form the adult body. |
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संबंधित प्रश्न
Correct the following statement if there is any mistake:
If there are 46 chromosomes in a cell, there will be 23 chromatin fibres inside the nucleus during interphase.
Humans have 46 chromosomes. Their sperms and eggs will have ______ chromosomes each.
Give a reason for the following:
Gametes must be produced by meiosis for sexual reproduction.
Differentiate between
Cytokinesis in plant and animal cell
Identify the stages of meiosven below and label them.
Give Technical Terms
The stage at which the formation of chiasmata occurs.
Complete the following sentence with appropriate word :
Polytene chromosomes are found in _________ of fly larvae.
Multiple Choice Question:
The disappearance of spindle and uncoiling of chromosomes takes place in
Duplicated chromosomes are joined at a point termed ______.
Write the functional activity of the following structure:
Spindle fibers
Name the following:
A specific part of a chromosome that determine hereditary characteristics.
Very Short Answer Question.
What is allosome?
The region of the chromosome where the spindle fibres get attached during cell division ______
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 |
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'.
Normally, genes occur in a pair of chromosome, but genes of X and Y chromosomes shows different gene loci indicating ______.
Define Aneuploidy.
Define the following term:
Chromatid
Distinguish between the following pair:
Karyotype and Karyokinesis
