The processes of synapsis and the formation of chiasmata
a. involve reciprocal exchange of chromosomal sections.
b. involve the recombination of DNA on homologous chromosomes.
c. bring about an increase in genetic variation.
d. provide evidence that an exchange of genetic material has occurred.
e. All of the above
Ans: e. All of the above
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A particular strain of yeast produces strains with a mutant cdc2 gene, resulting in little to no production of the Cdc2 protein kinase. As a result, one would expect that these cells would
A) not enter M phase. B) not have the nuclear envelope disperse. C) lack chromosome condensation. D) all of the above E) none of the above
Jack has type O blood and his mother has type A blood. His father could have any of the
following blood types EXCEPT
a. A. b. B. c. AB. d. O.
What is the function of the proboscis in nemerteans?
a. attracting mates b. capturing food c. sensing predators d. expelling wastes
Which of these was the dominant plant group at the time that dinosaurs were the dominant animals?
a) bryophytes b) charophyceans c) seedless vascular plants d) gymnosperms e) angiosperms