Which of the following is a weakness of the biological species concept?
A. It relies on the subjective judgment of experts to decide whether populations are similar enough to be the same species.
B. It requires phylogenetic trees, which haven't been estimated yet for many lineages.
C. It is not applicable to sexually reproducing species because the offspring are genetically distinct from the parents.
D. It isn't applicable to asexual, fossil, or geographically isolated species.
Answer: D. It isn't applicable to asexual, fossil, or geographically isolated species.
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Scientists use genome-wide association studies to research which of the following?
a. viral diseases b. single-gene inherited diseases c. diseases caused by multiple genes d. diseases caused by environmental factors
There are nine coat colors known in foxes. If a red
fox were crossed with a double-black fox, all the hybrids would be red above and black below in a pattern known as blended cross. If two blended crosses were mated, the F2 ratio would be as follows: 1 red, 2 smoky red, 2 cross red, 4 blended cross, 1 standard silver, 2 substandard silver, 1 Alaskan silver, 2 sub-Alaskan silver, and 1 double black. (a) Using the letters A/a and B/b to serve as the genes for these animals, develop a genotype for each variety listed. (b) Two crosses will produce all blended-cross offspring. One is used above (red fox x double black); what is the other? (c) List the genotype and phenotype of all the pure-breeding foxes. (d) Give the genotypic and phenotypic ratio of a cross between two substandard silvers. (e) Give the genotype and phenotype of the offspring produced in a cross of a sub-Alaskan silver and a cross red. What will be an ideal response?
Synapsis between chromosomes in some species is promoted by special DNA sequences known as
A) centromeres. B) telomeres. C) pairing sites. D) chiasmata. E) bouquets.
The creation of genetically identical offspring by a single parent, without the participation of sperm and egg, is called
A) asexual reproduction. B) sexual reproduction. C) regeneration. D) spontaneous generation.