Question
How is aneuploidy different from polyploidy? Mention their causes.
| S.No | Aneuploidy | Polyploidy |
| 1. | It is the phenomenon of loss or gain of one or more chromosomes from any pair(s) of chromosomes in a diploid cell/ organism, called aneuploid. | It is the presence of three or more sets of chromosomes in an organism, called polyploid. |
| 2. | It arises due to failure of segregation of members of one more pair(s) of homologous chromosomes. eg. Down's syndrome, Turner's sydrome, etc. | It arises due to failure of cytokineses following the telophase stage of cell division. |
| 3. | | It is found in many plants. |
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| S. No. | Column I | S. No. | Column II |
| A. | Cleavage | 1. | Outer layer of the blastocyst that attaches to the endometrium during implantation. |
| B. | Implantation | 2. | Mitotic divisions of the zygote in quick succession. |
| C. | Inner cell mass | 3. | Embedding of the blastocyst in the endometrium of uterus. |
| D. | Trophoblast | 4. | Release of secondary oocyte from the ovary. |
| E. | | 5. | Group of cells attached to one end of trophoblast that differentiate into embryo proper. |