The pseudoautosomal regions of the Y chromosome correspond to
A) male-specific regions of the Y chromosome.
B) female-specific regions of the Y chromosome.
C) counterparts on the X chromosome with which they can cross over.
D) places on the interior of the nuclear membrane where the Y chromosome attaches during cell division.
C) counterparts on the X chromosome with which they can cross over.
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A scientist collects a spore from a new species of fungus and observes that this spore has a flagellum. What does the presence of a flagellum suggest about the lifestyle of this species?
A. It is aquatic. B. It is an endomycorrhizal fungus. C. It relies on insects for spore dispersal. D. It is unicellular. E. Its spores are produced asexually.
HIS4 trp1; HIS4 trp1; his4 TRP1; his4 TRP1
A haploid yeast strain has mating type a and genotype his4 TRP1. A different haploid yeast strain has mating type ? and genotype HIS4 trp1. The two strains mate and produce diploid offspring with genotype his4 TRP1 / HIS4 trp1. The diploid cells undergo meiosis to produce a variety of tetrad types. In the following questions, the genotypes of the spores in a tetrad are shown. For each tetrad, tell what type it is: parental (PD), non-parental (NPD), or tetratype (T). A) PD B) NPD C) T D) cannot be determined
What did Charles Darwin propose after observing the 11-inch-long nectaries of the Angraecum sesquipedale orchid in Madagascar?
A. that the orchid was an evolutionary dead end and could no longer reproduce B. the existence of a pollinator moth with a proboscis of 10–11 inches C. the presence of very small bees that can fit into a long nectar tube D. that the orchid must reproduce asexually E. that the orchid was a self-pollinator and required no assistance from an organism
Which of the following is NOT a function of pili?
a. cell adhesion b. defense by poking holes in other cells c. exchange of genetic material d. twitching motility