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Author Question: Trisomy 21, or Down syndrome, occurs when there is a normal diploid chromosomal complement but one ... (Read 79 times)

cool

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Trisomy 21, or Down syndrome, occurs when there is a normal diploid chromosomal complement but one (extra) chromosome 21. Although fertility is reduced in both sexes, females have higher fertility rates than males. Van Dyke et al. (1995; Down Syndrome Research and Practice 3[2]:65—69) summarize data involving children born of Down syndrome individuals. Assume that children are born to a female with Down syndrome and a normal 46-chromosome male. What proportion of the offspring would be expected to have Down syndrome?
◦ One-third of the offspring would be expected to have Down syndrome.
◦ None of the offspring would be expected to have Down syndrome.
◦ All the children would be expected to have Down syndrome.
◦ Two-thirds of the offspring would be expected to have Down syndrome.
◦ One-half of the offspring would be expected to have Down syndrome.


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Marked as best answer by cool on Mar 26, 2020

Leostella20

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cool

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Reply 2 on: Mar 26, 2020
Wow, this really help


kusterl

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Reply 3 on: Yesterday
Excellent

 

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