Chemical signals that cause long term responses in the receiver are most specifically called:
a. hormones
b. signal pheromones
c. priming pheromones
d. communication signals
e. acoustical signals
c
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Some combinations of recessive alleles cause problems so severe that a fetus may cease to develop. Such lethal allele combinations appear to alter Mendelian ratios because
A) carriers do not constitute a progeny class. B) they do not show a 1:2:1 genotypic ratio. C) homozygotes for the lethal allele do not appear as a progeny class. D) homozygotes for the lethal allele pass it on to half their offspring.
What is the formation of two species from one original species called?
a. natural selection b. evolution c. speciation d. divergence
Disturbances in sensory neurons will result in an action potential if the
a. stimulus is graded. b. stimulus remains local. c. graded stimulus reaches a trigger zone. d. localized stimuli do not spread far. e. stimuli become downgraded to localized ones.
Most bacteria we are using in Lab are pathogenic
a. true b. false