Down′s syndrome is caused by an extra copy of chromosome number 21. What percntage of offsprin

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Down&#8242;s syndrome is caused by an extra copy of chromosome number 21. What percntage of offspring produced by an affected month and a normal father would be affected by this disorder ?

Accepted Answer

Down&#8242;s syndrome is the result of trisomy, in which chromosome pair number 21st contains an extra copy of chromosome (24 + 1). Affected mother will produce 50% normal egg cells and rest 50% eggs are of abnormal type.

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