Which is correct about the red-green colorblind in humans? A: loss of L or M cone genes on the X chromosome B: gain of S cone genes on the X chromosome C: loss of L or M cone genes on the Y chromosome D: gain of S cone genes on the Y chromosome

chromosome

chromosome ________

Sutton and Boveri developed the chromosome theory of heredity.

The exfoliative toxins, TSST-1, and the enterotoxins are all superantigens. The genes for these toxins are A: Present in all strains of Staphylococcus aureus B: Widely distributed on the staphylococcal chromosome C: On both the staphylococcal chromosome (TSST-1 and exfoliative toxins) and on plasmids (enterotoxins) D: On the staphylococcal chromosome in a pathogenicity island E: On plasmids

Principal indications for prenatal diagnosis by invasive testing: A: Previous child with a de novo chromosome abnormality B: Presence of structural chromosome abnormality in one of the parents C: Family history of an X-linked disorder D: Risk of a neural tube defect

S期的早熟凝集染色体(prematurely condensed chromosome，PCC)为（）

Another title for this reading could be ___________. ( Text 4A) A: Finding Y-Chromosome Adam B: Who Were the First Humans? C: What DNA Teaches Us About Our History D: The Discovery of DNA in Africa

A complete set of genes of a given species<br/>called ( ) A: genome B: gene C: DNA D: chromosome cDNA

If two men suspected for some reason they have a common ancestor, ______ . A: we can decide according to their family tree B: we can find the truth from their genetic markers C: we can compare the differences in their Y chromosome D: we can look for written records to prove their relationship