__________ is a diagnostic tool that reveals missing or extra chromosomes and some structural changes in an
individual's chromosomes. Fill in the blank(s) with the appropriate word(s).
ANSWER: Karyotyping
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Which of the following processes is NOT part of the communication at a neuromuscular junction? (Select all correct choices.)
A. The neuron releases a neurotransmitter to signal contraction by the muscle cell. B. A cell-surface receptor on the muscle cell is activated by acetylcholine binding. C. Upon activation, the acetylcholine receptor on the neuron undergoes a conformational change to activate an ion channel in the muscle cell. D. An opened ligand-gated ion channel allows sodium ions to rush across the plasma membrane to the inside of the muscle cell. E. A sudden influx of sodium ions across the plasma membrane drastically reduces the membrane potential and activates the contractile machinery of the muscle cell.
The sex chromosome composition of a person with
Klinefelter syndrome is a. XXX. b. XO. c. XXY. d. XYY. e. none of these.
The species concept that relies most heavily on the criterion that species are evolutionarily independent units that are isolated by gene flow is ________
A) the morphospecies concept B) the phylogenetic species concept C) the biological species concept D) This criterion is common to all of these concepts.
The X and Y chromosomes ____
a. are responsible for autosomal recessive inheritance b. will lead to color-blindness in all carriers c. are found paired with all 22 autosomal chromosomes d. are responsible for albinism e. play major roles in determining the sex of an individual