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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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nite_n_day nite_n_day
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10 years ago
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 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. Given the fact that conceptuses with 48 chromosomes (four chromosome 21s) are not likely to survive early development, what percentage of surviving offspring would be expected to have Down syndrome if both parents have Down syndrome?
A) One-third of the surviving offspring would be expected to have Down syndrome.
B) All the children would be expected to have Down syndrome.
C) None of the surviving offspring would be expected to have Down syndrome.
D) Two-thirds of the surviving offspring would be expected to have Down syndrome.
E) One-half of the surviving offspring would be expected to have Down syndrome.

Our teacher assigned this from our Essentials of Genetics book
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Would you know my name, if I saw you in heaven?

Eric Clapton
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germgerm
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10 years ago
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nite_n_day Author
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#2
10 years ago
Seriously, you're awesome. Let's be friends lol
Would you know my name, if I saw you in heaven?

Eric Clapton
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#3
10 years ago
You're welcome.

Bye for now.
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