Many alleles cause phenylketonuria (PKU). A unique mutation found only in Yemenite Jews is probably

A) more ancient than other PKU mutations.

B) a result of genetic drift.

C) due to a strong heterozygote advantage.

D) identical to the original allele.


B) a result of genetic drift.

Biology & Microbiology

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Cell division in the apical meristems at the tips of a plant that results in increases in height or length is called  

A.  primary growth. B.  secondary growth. C.  vascular cambium growth. D.  mitotic growth. E.  herbaceous growth.

Biology & Microbiology

Which of the following is NOT a form of active transport?

a. sodium-potassium pump b. endocytosis c. exocytosis d. diffusion e. ATP pump

Biology & Microbiology

If you observe a cell that contains organelles, then that cell is most likely a(n) prokaryote

__________________ Indicate whether the statement is true or false.

Biology & Microbiology

After amplifying one gene of interest using PCR (polymerase chain reaction), you pour your DNA sample into a gel to ensure that the reaction worked. To your surprise, two bands are present on the gel instead of a single band. What is a likely explanation for this outcome?

a. The gene contains a mutation. b. The gene is codominant. c. The DNA sample was derived from a haploid individual. d. Two alleles exist for the gene and they vary in size. The DNA sample was derived from a diploid individual.

Biology & Microbiology