In forensics, a DNA sample is analyzed to determine which alleles of 13 SSR loci are present. How is the probability of that specific combination of SSR alleles existing in the population calculated?
A) The frequency of each genotype is known from determining which allele is the rarest for each locus and then determining if the individual sample contains those alleles.
B) The total number of alleles for all loci in the population is calculated.
C) The Hardy-Weinberg Law is used to predict the genotype frequency at each locus.
D) The total number of alleles in the population is multiplied by 2.
C) The Hardy-Weinberg Law is used to predict the genotype frequency at each locus.
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A Giemsa stain is performed on an eye exudate on a patient with calabar swelling, eosinophilia, and a recent travel history to Africa. L. loa is suspected; however, the sheath in the adult worm recovered does not stain. Which one of the following statements explains this discrepancy?
a. The worm recovered is not L. loa. b. The specimen should have been stained with trichrome stain. c. The Giemsa stain is most likely expired. d. No discrepancy is present. The sheath does not stain with Giemsa stain.
Which plant specialization mutually benefits the young root and a fungus? a. All of these choices
b. Root nodules c. Mycorrhizae d. Root hairs e. None of these choices.
T, or transverse, tubes in skeletal muscle function to
A) transport calcium ions throughout muscle cells. B) allow actin and myosin filaments to slide over each other. C) promote the rapid penetration of the electrical impulse deep into the cell. D) help decrease the amount of ATP produced. E) convert glucose to lactic acid, which helps muscles relax.
Which one of the following occurs with each cycle of the sodium-potassium pump?
A) Sodium is moved into the cell, creating a net negative charge outside the cell. B) The net effect is removal of one osmotic particle and one positive charge from inside the cell. C) The net effect is removal of one osmotic particle and one negative charge from inside the cell. D) The inside of the cell becomes more negative as potassium is pumped out. E) Two potassium ions and three sodium ions are pumped out of the cell.