| Observe the given diagram of meiosis and germ cell formation in a cell with four chromosomes and answer the questions that follows. |
 |
| (ii) Sometimes chromosome number increases or decreases due to |
A) mutagenic change
B) non-disjunction of chromosome
C) genetic repeats
D) AII of the above
Correct Answer: B
Solution :
[b] Sometimes chromosome number increases or decreases due to non-disjunction of chromosome. It refers to condition of failure of homologous chromosomes or sister chromatids to separate during cell division.
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