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TLS Online TPP Program

#Question id: 11205

What would probably happen if a long neuron had one continuous myelin sheath down the length of the axon with no nodes of Ranvier?

#Unit 7. System Physiology – Animal
  1. The action potential would be propagated nearly instantaneously to the synapse.
  2. There could be no action potential generated at the axon hillock.

  3. The signal would fade because it is not renewed by the opening of more sodium channels.

  4. Only potassium could move across the membrane, but not sodium.
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TLS Online TPP Program

#Question id: 4761

#Unit 8. Inheritance Biology

which of the following statements about a lethal allele is not correct?
TLS Online TPP Program

#Question id: 4762

#Unit 8. Inheritance Biology

a semilethal allele is an example of which of the following extensions of mendelian genetics?
TLS Online TPP Program

#Question id: 4764

#Unit 8. Inheritance Biology

Which of the following is the best example of overdominance?
TLS Online TPP Program

#Question id: 4768

#Unit 8. Inheritance Biology

A trait that appears to be dominant in one sex but recessive in the other is called:
TLS Online TPP Program

#Question id: 4785

#Unit 8. Inheritance Biology

One form of white eye is a recessive X-linked gene in Drosophila. From a mating of a heterozygous wild-type Drosophila female with a white-eyed male, what is the probability of wild type offspring?
TLS Online TPP Program

#Question id: 4791

#Unit 8. Inheritance Biology

Body color in mice, YY is a recessive lethal, Yy yellow, yy gray and hair type straight is dominant over fuzzy. A geneticist crosses two yellow mice with heterozygous straight hair. Which the observe ratio is of obtains following progeny?