Epitokes of polychaetes are:
a. feeding structures.
b. respiratory structures.
c. reproductive individuals.
d. excretory structures.
e. feeding individuals.
C
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Answer the following statement true (T) or false (F)
During the process of swallowing, the
a. esophagus is temporarily closed by the glottis. b. epiglottis closes the trachea leading to the lungs. c. pharynx restricts food entry to the esophagus. d. epiglottis seals the esophagus. e. glottis seals the esophagus.
Use of double mutants has been invaluable in studying developmental pathways. In C. elegans, sex is determined by the ratio of sets of autosomes to X chromosomes. A diploid male has one X, and diploid hermaphrodites have two X's
The loss-of-function gene her-1 produces XO worms that are hermaphrodites, but XX worms are unaffected. Mutation of a second gene, tra, causes the XX to develop as male. Given this information, what would be the phenotype of a tra, her-1 double mutant? A) a male nematode B) a female nematode C) a hermaphrodite D) an intersex variant E) lethality
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Answer the following statement true (T) or false (F)