In parthenogenesis (select all correct choices):
A. unfertilized eggs develop into adults.
B. adults may be haploid or diploid.
C. adults may develop via mitosis or meiosis.
D. the parent may be either maternal or
paternal.
E. eggs may be fertilized or unfertilized.
A,B
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A parent cell of a certain organism has 16 chromosomes and undergoes meiosis. The resulting cells will have how many chromosomes?
a. 64 b. 32 c. 16 d. 8 e. 4
Luria and Delbruck grew many liquid cultures of bacteria then spread a small sample of each culture on nutrient agar infused with bacteriophage in separate petri plates. They assayed the number of bacterial colonies that formed on each plate. What did the appearance of a bacterial colony on a petri plate indicate?
A) The bacterial colony was derived from one initial cell that was resistant to infection by the bacteriophage. B) The bacterial colony was made up of many cells that became resistant to bacteriophage infection independently. C) A colony formed when a bacterial cell was not resistant to bacteriophage infection. D) The bacterial cells that made up a colony were resistant to antibiotic.
Nutritional mutations can be described as ________
A) those mutations that change the composition of the medium B) those mutations that do not allow a bacterium or fungus to grow on minimal medium but do allow growth on complete medium C) all strains that are not auxotrophic D) those mutations belonging to the group called prototrophs E) those mutations caused by site-specific mutagenesis
What is one difference between polyploidy and aneuploidy?
A) Polyploidy is extra sets of chromosomes; aneuploidy occurs when there are either more or fewer chromosomes than normally exist in its species full set. B) Polyploidy is one extra chromosome; aneuploidy is one missing chromosome. C) Humans can be viable as polyploids but not as aneuploids. D) Polyploidy is extra sex chromosomes; aneuploidy is extra autosomes. E) Polyploidy causes diseases and disorders in humans; aneuploidy does not.