题目内容

Which of the following chromosome constitutions would never lead to a viable human baby being born（）

A. YY
B. XXX
C. XYY
D. XO （O = the absence of a second chromosome）
E. XXY

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The R locus determines flower color in a new plant species. Plants that are genotype RR have red flowers, and plants that are rr have white flowers. However, Rr plants have pink flowers. What type of

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