Type of nuclear division that reduces the chromosome number from 2n to n; daughter cells receive the haploid number of chromosomes in varied combinations; also called reduction division.
What will be an ideal response?
Meiosis
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When two excitatory postsynaptic potentials (EPSPs) occur at a single synapse so rapidly in succession that the postsynaptic neuron's membrane potential has not returned to the resting potential before the second EPSP arrives,
the EPSPs add together producing _____. A) temporal summation B) spatial summation C) tetanus D) the refractory state E) an action potential with an abnormally high peak of depolarization
In several mammals, including some rat and shrew species, the presence of two X chromosomes means the animal will be a female, whereas having just one X chromosome dictates maleness. This type of sex determination is most similar to:
A. other mammals. B. insects. C. bees. D. birds.
For the amino acid glutamine, the three-letter abbreviation is ________ and the one-letter is ________.
Fill in the blank(s) with the appropriate word(s).
Sexual reproduction occurs when _______.
a. an unfertilized egg develops normally b. two female gametes fuse and develop c. a sperm from a male fuses with an egg from a female d. two male gametes fuse and develop