Using the genetic code shown here, predict what type of mutation has occurred in the hemoglobin sickle-cell anemia allele.
Normal allele 5'–GGAAUGAAACAGGAACCC–3'
Mutant allele 5'–GGAAUGAAACAGGUACCC–3'
A. a point mutation, Val to Glu
B. addition of a new stop codon
C. a frameshift mutation
D. a point mutation, Glu to Val
E. a silent mutation
D. a point mutation, Glu to Val
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Knowing an individual's DNA sequence may be beneficial because:
A. it makes it possible to predict susceptibility to disease. B. it makes it possible to predict response to medications. C. it makes it possible to predict physical differences. D. it makes it possible to predict the occurrence of a disease. E. All of the answer options are correct.
The process by which new species originate
A. is extinction. B. occurred for millions of years but is no longer occurring. C. is speciation. D. is germination. E. occurred only once in Earth's history.
____ cells are alive at maturity and have primary cell walls that are especially thick at the corners
a. Sclerenchyma b. Collenchyma c. Parenchyma d. Phloem e. Xylem
At metaphase I, the two homologous chromosomes of each bivalent are connected to spindle fibers from the _________.
a) random centromeres of other chromosomes b) the centromere of its neighboring chromosome c) same spindle pole d) the centromere of its homologue e) opposite spindle poles