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.
Answer:
Multiple factors drive the continued increase in STDs. Data suggest that multiple factors are contributing to the overall increase in STDs, including: Drug use, poverty, stigma, and unstable housing, which can reduce access to STD prevention and care; Decreased condom use among vulnerable groups, including young people and gay and bisexual men
Explanation:
Hope this helps!
Answer:
Everyone has different levels of melanin in them the more melanin you have the darker you are.
Explanation:
Sugar
Explanation- they are all prices
