To solve this problem, we need to analyze the statements related to amniocentesis and identify the incorrect one. Let's evaluate each option:$\newline \bullet$Option 1: It is usually done when a woman is between 14-16 weeks pregnant.$\newline$ - Amniocentesis is typically performed during the second trimester, around 14-16 weeks of pregnancy.$\newline$ - This statement is correct.$\newline \bullet$Option 2: It is used for prenatal sex determination.$\newline$ - Amniocentesis can be used to determine the sex of the fetus by analyzing the chromosomes.$\newline$ - However, using it for sex determination is illegal in many countries due to ethical concerns.$\newline$ - Despite the legal issues, the statement itself is factually correct.$\newline \bullet$Option 3: It can be used for detection of Down syndrome.$\newline$ - Amniocentesis is commonly used to detect chromosomal abnormalities such as Down syndrome.$\newline$ - This statement is correct.$\newline \bullet$Option 4: It can be used for detection of Cleft palate.$\newline$ - Cleft palate is a structural defect that cannot be detected through amniocentesis, which analyzes genetic material.$\newline$ - This statement is incorrect.$\newline$Therefore, the incorrect statement is Option 4.