Which of the following is NOT a reason rRNA
genes are able to be used to infer evolutionary relationships by phylogenetic analysis?
a. It is present in all cells.
b. It has the same function in all cells.
c. It is highly variable in sequence, quickly changing.
d. It is of sufficient length to be significant.
Answer: C
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The classic work of Huffaker demonstrated that orange-eating mites were able to survive predation by "mite-eating" mites provided that:
A. the starting size of the orange-eating mite population was large compared to that of the mite-eating mites. B. the starting size of the mite-eating mite population was below a certain threshold. C. the orange-eating mites were provided with ample food sources. D. the orange-eating mites had access to "refuges" where they were safe from predation. E. the mite-eating mites had access to "refuges" where they were isolated from parasites that infected orange-eating mites.
The female genetic ancestor of all living humans:
A. lived in Africa only 10,000 years ago. B. was the only living female of her tribe. C. was identified using haplotypes on the X chromosome. D. was the only female of her tribe to have children. E. was the only female whose mitochondrial DNA has been inherited in the modern human lineage.
Two snapdragons heterozygous for alleles that encode red and white flower color are crossed. If the red and white
alleles show incomplete dominance, what will be the ratios of phenotypes in the offspring?
a. 100% pink b. 100% red c. 50% white, 50% red d. 25% red, 50% pink, 25% white e. 25% pink, 50% white, 25% red
Describe the unusual pollination system used by orchids of the genus Catasetum, which are pollinated by male euglossine bees
What will be an ideal response?