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TLS Online TPP Program

#Question id: 21246

The correct sequence of events involved in phototransduction in rods and cones in response to light is:

#Unit 7. System Physiology – Animal
  1. activation of transducin, decreased release of glutamate, structural changes in rhodopsin, closure of Na + channels, and decrease in intracellular cGMP.
  2. decreased release of glutamate, activation of transducin, closure of Na + channels, decrease in intracellular cGMP, and structural changes in rhodopsin.
  3. structural changes in rhodopsin, decrease in intracellular cGMP, decreased release of glutamate, closure of Na + channels, and activation of transducin.
  4. structural changes in rhodopsin, activation of transducin, decrease in intracellular cGMP, closure of Na + channels, and decreased release of glutamate.
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TLS Online TPP Program

#Question id: 4816

#Unit 8. Inheritance Biology

A wild-type fruit fly heterozygous for gray body color and normal wings was mated with a black fly with vestigial wings to produced 1000 offspring. Recombination frequency between these genes for body color and wing type is 20 %. What number of offspring that is gray body colour and normal wing?
TLS Online TPP Program

#Question id: 4817

#Unit 8. Inheritance Biology

How many different gametes can be formed by an organism with genotype AaBbCCddEe, If a, b and c gene are completely link?
TLS Online TPP Program

#Question id: 4819

#Unit 8. Inheritance Biology

Plant with genotype AB/ab is test cross, two genes are linked are 10 map units apart. What proportion of progeny will have the genotype aabb?
TLS Online TPP Program

#Question id: 4820

#Unit 8. Inheritance Biology

Which of the following gametes are produced in grater proportional by an individual of genotype Ab/aB if the genes are in the same chromosome with some recombination between them?
TLS Online TPP Program

#Question id: 4821

#Unit 8. Inheritance Biology

What are frequency of recombination  if one cell carry out cross over every 50 cell undergoes meiosis ?
TLS Online TPP Program

#Question id: 4822

#Unit 8. Inheritance Biology

In a particular species of mammal black hair (B) is dominant to green hair (b) and red eyes (R) are dominant to white eyes (r). If a BbRr individual is mated with a bbrrindividual the expected phenotypic ratio of the offspring is 1 black-red : 1 black-white: 1 green-red : 1 green-white. However, when you mate these individuals you find that the phenotypic ratio of the offspring is 6 black-red :1 black-white : 1 green-red : 6 green-white. What could account for this difference?