TLS Online TPP Program

#Question id: 11201


Why are action potentials usually conducted in one direction?

#Unit 7. System Physiology – Animal
  1. The nodes of Ranvier conduct potentials in one direction.
  2. The brief refractory period prevents reopening of voltage-gated sodium channels.
  3. The axon hillock has a higher membrane potential than the terminals of the axon.
  4. Voltage-gated channels for both Na+ and K+ open in only one direction.
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TLS Online TPP Program

#Question id: 5330

#Unit 8. Inheritance Biology

First child of both affected couple has normal, an autosomal dominant disorder. What is probability of second child of this couple would have diseased?

TLS Online TPP Program

#Question id: 5336

#Unit 8. Inheritance Biology

In a cross between a heterozygous, red-eyed female fruit fly and a white-eyed male, what percent of the male offspring will have white eyes?(white eyes are X-linked, recessive)  

TLS Online TPP Program

#Question id: 5423

#Unit 8. Inheritance Biology

Maximum height of plant is 200 cm and minimum average height is 80cm. if plant height is controle by 5 pairs of polygene, which of the following plant exhibit average phenotype?

TLS Online TPP Program

#Question id: 5424

#Unit 8. Inheritance Biology

Imagine that height in corn plants is determined by three loci. The baseline height is 100 cm. Every + allele adds 10cm to the plant’s potential height, every – allele subtracts 10 cm from the plant’s potential height. The shortest possible plant and the tallest possible plant are mated to form an F1, what is the height of the F1?

TLS Online TPP Program

#Question id: 5425

#Unit 8. Inheritance Biology

Two varieties of maize averaging 50 and 20 inches in height, respectively, are crossed. The F1 progeny is quite uniform averaging 35 inches in height. Out Of the 16 F2 plants, the 5 are 35 inches. What is the probable number of independent segregating polygenes involved in this trait?

TLS Online TPP Program

#Question id: 5426

#Unit 8. Inheritance Biology

Which of the following is incorrect regard polygenic inheritance?