during meiosis
During meiosis
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.
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
Down syndrome is typically caused by an extra copy of chromosome 21, resulting from a process called nondisjunction, which occurs during cell division. This mutation can happen during the formation of the egg or sperm, or during the early stages of embryonic development. As a result, the genetic change that leads to Down syndrome occurs before or at the time of conception. Therefore, the mutation is present from the moment of fertilization.
During meiosis
during meiosis
During meiosis
During meiosis
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.
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
Down syndrome is typically caused by an extra copy of chromosome 21, resulting from a process called nondisjunction, which occurs during cell division. This mutation can happen during the formation of the egg or sperm, or during the early stages of embryonic development. As a result, the genetic change that leads to Down syndrome occurs before or at the time of conception. Therefore, the mutation is present from the moment of fertilization.
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.
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.