Question

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

25 percent

100 percent

75 percent

Answer 1

@lgbasallote

Answer 2

hurry dont have much time

Answer 3

.........

Answer 4

why r u giving test?

Answer 5

what?

Answer 6

no its not for a test

Answer 7

its for an assignment due today

Answer 8

http://www.downsyn.com/whatisds.php

this will help u

Answer 9

Is Down syndrome inherited?

The vast majority of cases of Down syndrome are not inherited. Only in cases of Translocation Down syndrome and then in only 1 of 3 cases of this type of Down syndrome is the condition inherited. These inherited cases occur because one of the parents is a carrier. A carrier will have 45 chromosomes instead of 46 but they will have all the genetic material of a person with 46 chromosomes. Remember that in Translocation Down syndrome the extra chromosome 21 material is located on a different chromosome. A carrier will have the extra material but will have only one chromosome 21. The carrier will not exhibit any of the symptoms of Down syndrome because they have the correct amount of genetic material.
A carrier will have an increased chance of having a child with Down syndrome. If the carrier is the mother, the chances are approximately one in five of having a child with Translocation Down syndrome. If the carrier is the father the odds are reduced to between one in twenty to fifty. In cases where the carrier has no unattached chromosome 21, all the carriers children will have Down syndrome. In all cases of Down syndrome but especially in cases of Translocation Down syndrome, it is important that the parents have genetic counseling to determine their risk.

"very long to read:("

Answer 10

A?

Answer 11

if the answer was 0% then i would have gone to it

but at present i will go with 50 %


Down Syndrome is caused by trisomy 21... an extra 21st chromosome. It's not an extra sex chromosome (X or Y). It's a mutation, but it wouldn't get passed down.

or

downs syndrome is the result of having an extra sex chromosome (normal people would have XX or XY). It's not an inherited trait.

Answer 12

thx

Answer 13

just do a punnet square :)