Geneticists construct linkage maps of chromosomes by
A) correlating a phenotype to an observable chromosomal abnormality.
B) determining the number of crossovers between genes on different chromosomes.
C) calculating the percent recombination between two genes on the same chromosome.
D) observing the number of genes on a chromosome.
C) calculating the percent recombination between two genes on the same chromosome.
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Mitochondria move from the cytoplasm into mitochondria using _____
Proteins coded for by nuclear DNA but found within A) signal sequences (peptides) B) random transport vesicles C) attachment of ribosomes to outer mitochondrial pores and direct deposition into the inner mitochondrial compartment D) mRNAs that are manufactured in the nucleus, but translated by mitochondrial ribosomes
The best conclusion concerning delta is that the cells _____
A) contain no DNA. B) contain no RNA. C) contain only one chromosome that is very short. D) are in the G0 phase. E) divide in the G1 phase.
Because they are filter feeders, oysters are
most sensitive to pollution levels in their habitat and among the first organisms to suffer if pollution levels become too high. Oysters are an example of ___ species.
a. an endangered b. an endemic c. an indicator d. a threatened e. a conserved
During the Pleistocene epoch, plant communities changed dynamically in response to:
a. a meteor impact. b. intense grazing pressure. c. competition with gymnosperms. d. iridium in the soil. e. fluctuating climates (ice ages).