Errors in meiosis can be one mechanism of evolution. A change in the number of chromosomes can lead to the production of new species. Some plant species may have originated from errors during cell division, which led to them having more than two sets of
chromosomes, a condition called polyploidy. Hypothesize what kind of error during meiosis might occur to cause a normally diploid plant to generate tetraploid offspring, in which the offspring have four sets of chromosomes.
What will be an ideal response?
There may be a failure of chromosomes to separate during meiosis, producing diploid gametes. If the plant self-fertilizes and a diploid sperm combines with a diploid egg, then a tetraploid zygote would be produced.
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Which combination of conditions would increase the rate of diffusion through a semipermeable membrane the most? I. steeper concentration gradients II. higher temperatures III. larger molecules
a. I only b. II only c. I and II d. II and III e. I, II, and III
Ribosomes are ____
a. membrane-enclosed organelles b. attached to the smooth endoplasmic reticulum c. involved in polypeptide transport
d. required for DNA synthesis e. involved in polypeptide synthesis
Cellulose is
a. a polysaccharide found in cell walls. b. a component of cell membranes. c. an oligosaccharide. d. formed by hydrolysis of monosaccharides. e. a component of invertebrate exoskeletons.
In the event that you are modeling weekly advertising spend (as a dependent variable), and you notice that several weeks have no spending-it is likely your analysis will have to handle what?
A. A selected sample problem B. A limited dependent variable C. An endogeneity problem D. A small sample problem