Most animal lineages evolved during the ___
period.
a. Cretaceous
b. Devonian
c. Ordovician
d. Silurian
e. Cambrian
E
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Acridine dyes are mutagens that
A) disrupt the reading frame of the gene. B) replace an AT base pair with a GC base pair. C) reverse the polarity of the double helix. D) kill cells.
Extrinsic ecological factors such as the physical environment and the presence of predators or competitors influence age specific rates of mortality and survivorship
Indicate whether the statement is true or false
If a parent cell has 22 chromosomes, the daughter cells following meiosis II will have
a. 22 chromosomes. b. 44 chromosomes. c. 11 chromosomes. d. All of these are correct.
If every sexually reproducing organism has only two alleles for each gene, how can there be a range of traits seen for a physical characteristic?
A) There can be more than two variations of a gene in a population. B) One of the alleles in an organism is expressed at different levels, while the other is turned off. C) Sometimes one of the alleles works, and other times the other allele works. D) In a population there are only two variations of a gene, but they are blended differently during sexual reproduction.