Which statement about variation is true?
A) All phenotypic variation is the result of genotypic variation.
B) All genetic variation produces phenotypic variation.
C) All nucleotide variability results in neutral variation.
D) All new alleles are the result of nucleotide variability.
D
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Which statement correctly describes the similarity of centromeres in different organisms?
A) Both yeast and plant centromeres have two 10-to-15 bp conserved elements. B) Yeast centromeres have fewer satellite DNA repeats than do human centromeres. C) Both human and plant centromeres are composed of repeated satellite DNA sequences. D) Yeast centromeres have fewer satellite DNA repeats than do plant centromeres.
Would you recommend genetic testing for the APOE*4 allele in family members of an Alzheimer disease patient?
Why or why not? What will be an ideal response?
The breast cancer gene BRCA1 has a very similar sequence in humans, mice, and gorillas, due to its origination in a common ancestor. The BRCA1 genes in these species are examples of ________.
A. synteny B. paralogs C. orthologs D. polyploidy
A woman struggling with a bacterial illness is prescribed a month's supply of a potent antibiotic. She takes the antibiotic for about two weeks and feels much better. Should she save the remaining two-week supply, or should she continue taking the drug?
A) She should save the drug for later, because if she keeps taking it the bacteria will evolve resistance. B) She should save the drug for use the next time the illness strikes. C) She should save the drug because antibiotics are in short supply, and she may need it to defend herself against a bioterrorism incident. D) She should continue taking the drug until her immune system can completely eliminate the infection. Otherwise, some bacteria may remain in her system, and they will probably be resistant.