Synapsis is the
A. exchange of genetic material between homologous chromosomes.
B. condition in which homologous chromosomes pair and lie close to each other.
C. independent assortment of homologous chromosomes.
D. separation and movement of homologous chromosomes to the poles.
B. condition in which homologous chromosomes pair and lie close to each other.
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Beadle and Tatum discovered that metabolic pathways are studied most effectively using which of the following techniques?
A) creating multiple gene mutations resulting in nonfunctional enzymes specific to a metabolic pathway B) adding intermediates to a metabolic pathway C) removing all intermediates of a metabolic pathway D) creating single gene mutations resulting in nonfunctional enzymes specific to a metabolic pathway
The most prevalent antibody, which is able to cross the placenta, is __________.
What will be an ideal response?
Which of the following is a limit of evolution that results in exaptations?
A) Natural selection and sexual selection can work at cross-purposes to each other. B) Evolution is limited by historical constraints. C) Adaptations are often compromises. D) Chance events affect the evolutionary history of populations in environments that can change unpredictably.
DNA is constructed of
A) a single strand of nucleotides with internal hydrogen bonding. B) two complementary strands of nucleotides bonded A—C and G—T. C) two strands of nucleotides running antiparallel. D) two strands of identical nucleotides with hydrogen bonds between them. E) None of the answers is correct.