★ Genes, Chromosomes and Genome Quiz
People with Tetrasomy X have
A. two extra copies of the X chromosome
B. one less x chromosome
C. two X chromosomes and two Y chromosomes
D. two copies of chromosome 21
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What is the name of the part labelled U
A. homologous chromosomes
B. sister chromatids
C. centromere
D. replication
E. gene loci
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