Epidemiology is the study of disease in individuals.
a. true
b. false
Answer: b. false
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In the first step in oogenesis
A) a primary oocyte divides to form a secondary oocyte and a first polar body. B) an oogonium accumulates cytoplasm and DNA replicates. C) a stem cell divides to yield an oogonium and a spermatogonium. D) an oocyte divides to yield two polar bodies.
Which of the following statements is true of linkage?
A) The closer two genes are on a chromosome, the lower the probability that a crossover will occur between them. B) The observed frequency of recombination of two genes that are far apart from each other has a maximum value of 100%. C) All of the traits that Mendel studied—seed color, pod shape, flower color, and others—are due to genes linked on the same chromosome. D) Linked genes are found on different chromosomes.
In the laboratory, fruit flies (Drosophila) were artificially selected for the number of bristles on their bodies. One population (R) was selected for low numbers of bristles, a second population (S) for high numbers of bristles.
In order for the scientists to artificially select Drosophila for their number of bristles,
A. they had to induce mutations into their populations of Drosophila. B. genetic variation had to be present in the population. C. the number of bristles in each Drosophila had to be random. D. dramatic mutations had to be produced by the selection. E. they had to study the population for millions of years.
Which of the following illustrates a negative feedback mechanism that occurs in the human body?
a) the release of insulin from the pancreas in response to an increase in blood sugar levels b) the release of glucagon from the pancreas in response to an increase in blood- sugar levels c) the release of oxytocin resulting in uterine contractions as childbirth is underway d) chemical reactions that result in coagulation due to fibrin being released