And hence this form of down syndrome is said to be trisomy 21. Down syndrome. So the reason this is a male individual and not a female individual is because this is the X chromosome sex chromosome, and this is the Y sex chromosome. If this was an X chromosome, then in that case we would have a female individual. Now let's discuss how the age of the female actually affects or actually increases the likelihood of down syndrome. So remember, in female individuals, all the excels that the female individual will ever have in her lifetime are formed before birth.