Estimates of spontaneous mutation rates are made using dominant disorders because
A) it takes several generations for the phenotype to change.
B) they do not affect offspring.
C) the mutant phenotype is obvious.
D) they can be identified by DNA sequencing.
C) the mutant phenotype is obvious.
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Among flowering plants, 30% to 80% of existing species are polyploidy somewhere within their evolutionary history
A. true B. false
In the past, oxygen uptake in a patient was measured as a means of determining whether a certain endocrine gland was working properly. Which of the following glands was this method most likely assessing?
A) parathyroid B) testes C) pineal D) thyroid
Humans contract Chagas disease when the reduviid bug defecates while taking a blood meal and the parasites in the feces are rubbed or scratched into the bite wound or onto mucosal surfaces. Which stage in the blood infects the host cells?
a. Amastigote b. Epimastigote c. Trypomastigote d. Promastigote
The second-generation offspring of a cross between individuals who are homozygous for different alleles of a gene are called the _____
a. F1 generation b. F2 generation c. hybrid generation d. none of these