$(1)$ 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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Polytene chromosomes in salivary glands are formed as a result of:
Medium
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 |
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View SolutionProgrammed cell death is scientifically termed as
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View Solution$A$ cell at the telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at the telophase stage. There is no formation of a cell plate,and thus the cell contains a higher number of chromosomes compared to other dividing cells. This would result in:
MediumNEET 2016
View SolutionSelect the correct match for $X$ and $Y$:
Column $X$ Column $Y$ $(1)$ Attachment site of spindle fibers $(P)$ Cell cycle $(2)$ Pairing of homologous chromosomes $(Q)$ Kinetochores $(3)$ Exchange of genes $(R)$ Synapsis $(4)$ Interval between two successive cell divisions $(S)$ Crossing over
| Column $X$ | Column $Y$ |
| $(1)$ Attachment site of spindle fibers | $(P)$ Cell cycle |
| $(2)$ Pairing of homologous chromosomes | $(Q)$ Kinetochores |
| $(3)$ Exchange of genes | $(R)$ Synapsis |
| $(4)$ Interval between two successive cell divisions | $(S)$ Crossing over |
Medium
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