What is a punnet square for Down syndrome?

Answer 1

Down syndrome is not represented by a punnett square because it is not a genetic disorder. Instead, it is a chromosomal disorder. Humans have 23 pairs of chromosomes adding to a total of 46 chromosomes. Individuals who have Down Syndrome have a total of 47 chromosomes because instead of having a set of 2 #21 chromosomes, he/she has 3 #21 chromosomes. This is a result of nondisjunction which can occur during meiosis. During meiosis, the chromosomal number is supposed to be halved. During nondisjunction, all of the homologous chromosomes (matching chromosomes from mom and dad) do not separate during meiosis. In the case of Down Syndrome, the #21 chromosomes fail to separate during meiosis. This results in an egg or sperm cell having one less or one more chromosome #21. If a normal egg or sperm forms a zygote with a egg or sperm that has an extra #21 chromosome, the resulting person will have Down Syndrome, also called Trisomy 21. The same thing can happen for other chromosomes, resulting in a different disorder.

This question has been improved by another user: actually, this is both a genetic disorder and a chromosomal disorder. It is a genetic disorder because this disorder is often transmitted from one (or both) of the parents to their young. It is possible to make a punnett square, however there is a better way to do this, which is why you probably will not find a punnett square of this disease online. The better way is by using a karyotype. I know this because i am in a 9th grade bio honors class and i have been studying this disease for over 2 weeks now.. hi yea no your wrong because down syndrome is a genetic disorder :)

Answer 2

your face! haha!

Answer 3

There isn't one.