Question 3
Narcolepsy is a sleep disorder found in some breeds of dogs. The gene linked to
narcolepsy has two alleles. Two dogs, both without narcolepsy breed and
produce a litter of four puppies: one male and one female with narcolepsy, and
one male and one female without narcolepsy
Which of the following identifies and explains the probability that another
puppy with the same parents will have narcolepsy?
0%, because the parents already have two puppies with narcolepsy
25%, because narcolepsy is a recessive trait
75%, because narcolepsy is a dominant trait
50%, because of the puppies from the first litter had narcolepsy

Choose the incorrect statement (a) the motor end plate membrane is only capable of generating graded potentials, but it is contiguous with the skeletal muscle sarcolemma, which can generate action potentials. (b) propagation of an action potential through the t-tubules into the sarcoplasmic reticulum triggers the release of ca++ into the cytoplasm of a skeletal muscle fiber. (c) the generation of suprathreshold endplate potentials in multiple muscle fibers could be due to the increased frequency of action potential generation at the axon hillock of a single motor neuron. (d) a greater amount of ach would be found in the presynaptic vesicles of a motor unit that fired several action potentials after exposure to botulinum toxin, than in a motor unit that fired several action potentials after exposure to the venom of the krait snake (which contains α-bungarotoxin).

How are fossils most commonly formed

First dropdown options: a. runoff b. condensation c. evaporation second dropdown options: a. photosynthesis b. transpiration c. sweating third dropdown options: a. raindrops b. clouds c. animals