In which model of selection are both alleles maintained in a population? a. selection against one allele b. selection against heterozygotes c. exactly three of these responses are correct. d. exactly two of these responses are correct. e. selection against both homozygotes?

How is ribosomal rna useful as a molecular clock? a. a large portion of the dna ring is not vital to structure or function, allowing it to accumulate neutral mutations. b. its rate of mutation increases over time as organisms continue to evolve and differentiate from each other. c. a slow mutation rate makes it useful for determining evolutionary relationships between ancient species. d. it is only found in select organisms, making it easier to compare relationships between species that have it.

Identify the composition of oceanic and continental crystal rocks.in a model of earth’s interior,where would these rocks appear?

What are the fixed alleles in the human species? o a. the alleles that are on the most chromosomes b. the alleles that change most often 000 c. the alleles that no one has d. the alleles that everyone has