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.
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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.
Which of the following is NOT a form of active transport?
a. sodium-potassium pump b. endocytosis c. exocytosis d. diffusion e. ATP pump
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.
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.