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31 July, 01:30

Using your knowledge of meiosis and the formation of gametes, consider the following information. Down syndrome is caused by nondisjunction of chromosome pair 21. If a person with Down syndrome has a child with a person who does not have Down syndrome, what is the probability that the child will have Down syndrome?

50 percent

0 percent

100 percent

75 percent

+2
Answers (2)
  1. 31 July, 02:38
    0
    Its not 0 percent and its not 100 percent. So, that leaves us with A or D, It is most likely a 50/50 chance.
  2. 31 July, 04:21
    0
    As can be seen from the Punnett Cross, there is a fifty (50) percent chance that if one of the parent has a Non-disjunctive Chromosome 21 that the offspring being born will also carry the Non-disjunctive Chromosome as well.

    I added an extra diagram for additional information purposes. In your spare time, for a better understanding of the special case of Down-Syndrome and other genetic situations caused by a Non-Disjunctive Chromosome pair you could just do a little reading on the Trisomic Zygote which is as a result of the Non-Disjunctive Chromosome from one parent and another Chromosome from the other parent.
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