In which of the following is the presence of different mating types critical to sexual reproduction?
A. Sporangiospore-producing species
B. Heterothallic species
C. Homothallic species
D. Arthrospore-producing species
Answer: B
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What is the origin of restriction endonucleases?
A. They are part of DNA repair mechanisms in eukaryotic cells B. They are a defense mechanism against viruses in bacteria C. They are replication enzymes of yeast D. They are transposable elements of Drosophila
After acrosomal reactions occur in one location, why does an egg release proteins in other locations?
a. To prevent multiple sperm from fertilizing the egg b. To ensure that rapid cell division takes place c. To protect the developing embryo d. To allow implantation of a blastocyst
Identical (monozygotic) and fraternal (dizygotic) twins provide a natural experiment for investigating the influence of genetics on traits
Outline a study approach using twins, assuming you could identify enough pairs, in which you are examining the relative contribution of genetics on blood cholesterol level.
How many chromosomes are provided to a zygote from each gamete?
A) 46 pairs B) 46 C) 23 D) none of the above