What might be the outcome of repeated duplications of one or a few genes in a species' genome?

A) tetraploidy
B) semisterility
C) the presence of gene families
D) repetitive DNA that is of no use to the cell
E) fusion of segments of two chromosomes into one


C) the presence of gene families

Biology & Microbiology

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About 4% of those of Northern European descent are carriers for ____, an autosomal recessive genetic

disorder where a defective membrane transport protein leads to abnormal chloride levels in extracellular fluids.

a. Duchenne muscular dystrophy b. phenylketonuria c. achondroplasia d. sickle-cell anemia e. cystic fibrosis

Biology & Microbiology

Which of the following are potentially pathogenic to humans?

a. Archaea b. Bacteria c. Archaea and Bacteria d. Cyanobacteria e. Methanogens

Biology & Microbiology

The conjugation bridge in an Hfr × F? mating usually breaks before chromosome transfer is complete; however, because at least part of the plasmid is transferred first, the recipient becomes F+.

Answer the following statement true (T) or false (F)

Biology & Microbiology

Homologues of the nascent-chain-associated chaperone (NAC) protein folding system are found in bacteria, eukaryotes, and archaea.

Answer the following statement true (T) or false (F)

Biology & Microbiology