What are the gametic consequences of a lack of cytokinesis following the first or second meiotic division?
What will be an ideal response?
The result will be a change in the number of complete set of chromosomes. If the individual is a diploid organism, and cytokinesis fails to occurs at meiosis I, half the gametes will have no sets of chromosomes and half will have two sets of chromosomes. If cytokinesis fails at meiosis II, half the gametes will have one set of chromosomes (normal condition), one-fourth of them will have two sets, and one-fourth of them will have no sets.
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Placing celery sticks in fresh water will make them more turgid and harder. This is because
A. the celery is hypotonic to fresh water. B. the celery is hypertonic to fresh water. C. the celery is isotonic to fresh water. D. water moves from the celery sticks into fresh water. E. salt moves from the water into the celery sticks.
Seawater and freshwater mix in which coastal region?
a. hydrothermal vents b. coral reefs c. seamounts d. tidal pools e. estuary
When the immune systems no longer distinguishes between self and nonself, _____ can result
a. autoimmunity b. anaphylaxis c. viral infections d. minor allergic reactions e. enhanced immune response
Humans share several features with salamanders. Certain genes and proteins are nearly identical between the two species; both species have four limbs with a similar skeletal structure; the species' early embryos are similar; and where the salamander has
a functional tail, humans have a vestigial tailbone. In evolutionary terms, these are examples of A) geographic similarity. B) homology. C) adaptation by natural selection. D) artificial selection.