$(1)$ Definition / Explanation: Chiasmata
$(2)$ Definition / Explanation: Syncytium
$(2)$ Definition / Explanation: Syncytium
(N/A) $(1)$ During the diplotene phase of meiosis-$I$,the homologous chromosomes begin to separate from each other except at the sites of crossovers. These $X$-shaped structures are called chiasmata.
$(2)$ In some organisms,karyokinesis (nuclear division) is not followed by cytokinesis (cytoplasmic division),as a result of which a multinucleate condition arises,leading to the formation of a syncytium.
$(2)$ In some organisms,karyokinesis (nuclear division) is not followed by cytokinesis (cytoplasmic division),as a result of which a multinucleate condition arises,leading to the formation of a syncytium.
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Similar Questions
Select the correct statements.
$A$. Tetrad formation is seen during Leptotene.
$B$. During Anaphase,the centromeres split and chromatids separate.
$C$. Terminalization takes place during Pachytene.
$D$. Nucleolus,Golgi complex and $ER$ are reformed during Telophase.
$E$. Crossing over takes place between sister chromatids of homologous chromosomes.
Choose the correct answer from the options given below:
$A$. Tetrad formation is seen during Leptotene.
$B$. During Anaphase,the centromeres split and chromatids separate.
$C$. Terminalization takes place during Pachytene.
$D$. Nucleolus,Golgi complex and $ER$ are reformed during Telophase.
$E$. Crossing over takes place between sister chromatids of homologous chromosomes.
Choose the correct answer from the options given below:
MediumNEET 2023
View SolutionWhich cells are formed after division?
Easy
View SolutionSelect the correct match for $X$ and $Y$:
Column $X$ Column $Y$ $(1)$ Tetrad $(P)$ Zygotene stage $(2)$ Chiasmata $(Q)$ Diplotene stage $(3)$ Splitting of centromere $(R)$ Meiosis $(4)$ Bivalent $(S)$ Pachytene stage $(T)$ Anaphase $(U)$ Mitosis
| Column $X$ | Column $Y$ |
| $(1)$ Tetrad | $(P)$ Zygotene stage |
| $(2)$ Chiasmata | $(Q)$ Diplotene stage |
| $(3)$ Splitting of centromere | $(R)$ Meiosis |
| $(4)$ Bivalent | $(S)$ Pachytene stage |
| $(T)$ Anaphase | |
| $(U)$ Mitosis |
Difficult
View SolutionWhile examining the mitotic stage in a tissue,one finds some cells with $16$ chromosomes and some with $32$ chromosomes. What possible reasons could you assign to this difference in chromosome number? Do you think cells with $16$ chromosomes could have arisen from cells with $32$ chromosomes or vice versa?
Medium
View SolutionObserve the diagrams carefully and identify the different stages of mitosis $(A-C)$ by choosing the appropriate options given below.
Medium
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