The sex of the fruit fly Drosophila melanogaster is determined as follows: XX chromosomes give a female and XY give a male. The gene for bar eyes is recessive and located on the X chromosome. If a male with normal eyes is mated with a female who has normal eyes but is heterozygous,
A. all of the female offspring will have bar eyes.
B. 1/2 the offspring will have bar eyes.
C. 1/2 the males will have bar eyes.
D. none of the offspring will have bar eyes.
C. 1/2 the males will have bar eyes.
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Fermentation can be performed only by bacteria and not by archaeons
A. true B. false
Which of the following parts of angiosperms is
not a food source? a. roots. b. fruits. c. shoots. d. nectar. e. all of these are food sources
Diffusion of calcium into the synaptic knob of a presynaptic neuron generates which immediate response?
Deactivation of neurotransmitters by enzymes in the synaptic cleft Absorption of neurotransmitters by the postsynaptic neuron Repolarization of the postsynaptic neuron Fusion of synaptic vesicles with the neuron’s plasma membrane and release of neurotransmitter