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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: 5448

#Unit 8. Inheritance Biology

Plant height control by 3 pair of polygene, two varieties of maize averaging 48 and 72 inches in height, respectively, are crossed. The F1 progeny is quite uniform averaging 60 inches in height. What is number of average phenotype out of 500 F2 plants?
TLS Online TPP Program

#Question id: 5449

#Unit 8. Inheritance Biology

Most behavioral traits are affected by many different genetic influences as well as environment. The best descriptor for such traits is:
TLS Online TPP Program

#Question id: 5450

#Unit 8. Inheritance Biology

Which of these definitions of heritability is most correct?
TLS Online TPP Program

#Question id: 5751

#Unit 8. Inheritance Biology

A biochemical mutant that must be supplied with a particular nutrient for growth would be described as a(n)
TLS Online TPP Program

#Question id: 5346

#Unit 8. Inheritance Biology

The following typical pedigree illustrates the key point that affected children are born to unaffected parents: Which of the following is correct statement?
TLS Online TPP Program

#Question id: 13144

#Unit 8. Inheritance Biology

Shell coiling of the snail Limnaea peregra(genetic maternal effect)  the shell coils (s+s+) which is termed dextral coiling, while some snails exhibiting sinistral coiling (ss). The allele for dextral (s +) is dominant over the allele for sinistral (s). If a male homozygous for dextral alleles (s+s+) is crossed with a female homozygous for sinistral alleles (ss) all of the F1 are heterozygous (s+s) and have a sinistral shell. If these F1 snails are self-fertilized, what is the phenotype of the F2 snail?