In a man heterozygous for all six genes, what fraction of his sperm would be recombinant in the a-f interval?
Suppose the map for a particular human chromosome interval is:
a——1 m.u.——b——1 m.u.——c——1 m.u.——d——1 m.u.——e——1 m.u.——f
A) 0%
B) 1%
C) 2.5%
D) 5%
E) cannot be determined
D) 5%
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After giving birth, female bighorn sheep lick their newborn lambs. This behavior continues off and on for up to 6 hours, after which mothers no longer lick their lambs. What is/are the ultimate cause(s) of this behavior? Check all that apply.
_____ Hormones released during labor stimulate motor neurons in female bighorn sheep, causing them to lick and groom their lambs. _____ The lamb is stimulated by the licking to begin nursing from its mother and the sooner a lamb begins nursing, the better its chances for survival. _____ Female bighorn sheep remember being licked by their mothers and know they must teach this behavior to their own offspring. _____ Licking the lamb removes excess moisture from its coat, preventing hypothermia. _____ When licking the lamb, the mother learns its unique scent so she can distinguish it from other lambs and offer it protection from predators or extreme weather.
Avogadro's number represents the ____
a. number of grams in a mole of substance b. number of moles in a gram of substance c. number of atoms in one gram of substance d. atomic weight of an atom divided by the weight of an atom of that element e. weight of an atom of an element divided by the atomic weight of that element
Which of the following might be expected in the logistic model of population growth?
A) As N approaches K, b increases. B) As N approaches K, r increases. C) As N approaches K, d increases. D) Both A and B are true. E) Both B and C are true
Neurotransmitters are released upon stimulation from a nerve impulse by the ________
A) myofibrils B) sarcoplasmic reticulum C) thick filaments D) axon terminals of the motor neuron E) sarcolemma of the muscle cell