The gene for normal skin pigment (A) can also code for the recessive trait of albinism (a). An albino man and a homozygous normal pigmented woman marry and have four children. What is the phenotype of the children?
Answer: 100% normal skin pigment
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Which of the following is the correct sequence of events for muscle contractions?
A) muscle cell action potential, neurotransmitter release, ATP-driven power stroke, calcium ion release from SR, sliding of myofilaments B) motor neuron action potential, neurotransmitter release, muscle cell action potential, release of calcium ions from SR, ATP-driven power stroke, sliding of myofilaments C) neurotransmitter release, motor neuron action potential, muscle cell action potential, release of calcium ions from SR, ATP-driven power stroke D) neurotransmitter release, muscle cell action potential, motor neuron action potential, release of calcium ions from SR, sliding of myofilaments, ATP-driven power stroke
X-rays can be used to view bones because
A. x-rays react with bone. B. x-rays pass through bone. C. bones are less dense than soft tissue. D. x-rays cannot pass through bone.
Baldness
A. occurs only in men. B. is more common in men than in women. C. is related to levels of growth hormone. D. is related to estrogen levels. E. is not genetic.
Which of these regions is NOT associated with the ventral (anterior) portion of the head?
A) buccal B) oral C) orbital D) occipital E) nasal