Nondisjunction is defined as the failure of the chromosomes to seperate during cell division. An animal with a haploid number of 6 (diploid number of 12) undergoes meiosis, and at the meiosis II (cells are already haploid from the meiosis I), nondisjunction occurs. The mature ovum will contain 6+1 chromosomes (n+1) because there is an extra chromosome from the nondisjunction. The second polar body will contain 5 chromosomes (normal would be 6) because the second polar body did not receive that extra chromosome due to nondisjunction. In the event of fertilization of the abnormal ovum with a normal sperm, the zygote will be a diploid (12 chromosomes) normally but since the ovum as an extra chromosome from the nondisjunction then the zygote will have an extra chromosome (13 chromosomes). One pair of chromosomes has an extra single chromosome and this is called a trisomy.
To ensure safety, leftovers that have been properly wrapped and refrigerated should be eaten within<u> three days.</u>
Leftovers can be kept for three to four days in the refrigerator. We should be sure to eat them within that time. After that, the risk of food poisoning increases. Food poisoning is the result of eating contaminated, spoiled, or toxic food. hence, to avoid such condition food must be consumed within shortest duration possible.
Learn more about Food Poisoning here:
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It means the completion or approval of a finished and definitive version of something.
