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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 :)
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∙ 13y ago
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How do you work a punnet square?
A punnet square is a box of 4 sections
Who was Reginald Punnet?
He found the punnet square
What is a non-example for a punnet square?
A banana is a good example of a punnet square since it has absolutely nothing to do with a punnet square.
How do you put RrYY in a punnet square?
you would need to have something else to cross it with to make it a punnet square.
How do you work punnet squares?
A punnet square is a box of 4 sections
What is an antonym of punnet square?
I
What is the punnet square for?
the punnet square is used for combining genes of two people or animals to predict the outcome of an offspring
What use is the punnet square?
the punnet square is used for combining genes of two people or animals to predict the outcome of an offspring
What was the grid used to prdict patterns of inheritance based on genotype of parents called?
Punnett square
Where was the punnet square made?
in your face
Does a punnet square show the genotype?
no
What is a chart that shows all possible allele combination resulting from a genetic cross?
Punnet squares show all possible allele combinations resulting from a genetic cross
