Trisomy occurs when there is an extra chromosome present in the cells, typically due to an error in cell division during the formation of sperm or egg cells. This mutation can happen during meiosis, the process of cell division that produces gametes, leading to a fertilized egg with three copies of a chromosome instead of the usual two. In the case of Down syndrome (trisomy 21), for example, this error occurs during the formation of the egg or sperm, and the exact timing can vary, but it generally happens before conception.
during meiosis
A chromosomal mutation can occur either during the formation of the egg or sperm, or after fertilization when the zygote is forming. This means the mutation could have occurred in the parent's gametes, or during cell division in the early stages of embryo development.
During meiosis
A normal human baby is born with 10 toes, 5 on each foot. Occasionally a genetic mutation will occur and baby will be born with more or less toes.
A normal human baby is born with 10 toes, 5 on each foot. Occasionally a genetic mutation will occur and baby will be born with more or less toes.
during meiosis
during meiosis
During meiosis
A chromosomal mutation can occur either during the formation of the egg or sperm, or after fertilization when the zygote is forming. This means the mutation could have occurred in the parent's gametes, or during cell division in the early stages of embryo development.
During meiosis
During meiosis
Abraham Chill was born in 1912.
MC Chill was born in 1970.
Chill Wills was born on July 18, 1903.
Dieter Chill was born on October 8, 1954.
Kurt Chill was born on 1895-05-01.
Ollie Chill was born on 1878-08-02.