Which Of The Following Statements Regarding Familial Down Syndrome Is False?

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Which Of The Following Statements Regarding Familial Down Syndrome Is False?

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If one parent is a translocation heterozygote for chromosomes 14/21, a child born to this parent is as likely to have Down syndrome as he is to be normal. - Three viable zygote types are possible when fertilization occurs between one normal and one heterozygous parent. One-third has a normal chromosome complement, one-third is a carrier, and one-third has Down syndrome. ---- - It accounts for approximately 5% of all Down syndrome cases. - Heterozygous carriers of the Robertsonian translocation that causes familial Down syndrome can have children who are phenotypically normal and are not carriers of the translocation. - Heterozygous carriers of the Robertsonian translocation that cause familial Down syndrome can have children who are also carriers of the translocation.
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