Trisomy 21,or Down Syndrome,occurs When There Is a Normal Diploid

question 34

Essay

Trisomy 21,or Down syndrome,occurs when there is a normal diploid chromosomal complement of 46 chromosomes plus one (extra)chromosome #21.Such individuals therefore have 47 chromosomes.Assume that a mating occurs between a female with Down syndrome and a normal 46-chromosome male.What proportion of the offspring would be expected to have Down syndrome? Justify your answer.

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