In what way can loss of heterozygosity lead to cancer?
What will be an ideal response?
Loss of heterozygosity occurs when a cancer-producing gene that exists in the heterozygous state becomes exposed through deletion, mutation, recombination, or chromosomal aberration. Such a gene now is either homozygous or hemizygous.
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Transition mutations can result from
A. chemical modification of an existing base in the DNA so that in the next round of replication it will pair differently from the unmodified base. B. a small insertion or deletion. C. incorporation of a base analog that exhibits different base-pairing properties from the base it replaces and chemical modification of an existing base in the DNA so that in the next round of replication it will pair differently from the unmodified base. D. incorporation of a base analog that exhibits different base-pairing properties from the base it replaces.
An oil spill occurs, and Greg (a member of the clean up team) suggests adding fertilizer. Why is he making this suggestion?
A. The fertilizer encourages the growth of microbes that can break down the oil. B. The chemicals in the fertilizer digest the oil residues. C. The fertilizer interacts with the oil droplets and renders them harmless. D. The fertilizer volitizes the oil.
Legless caecilians belong to the ____ lineage
a. Caudata b. Aves c. Squamata d. Gymnophiona e. Anura
In humans, if nondisjunction led to an individual with a genotype of XO, that person would
A. display both male and female characteristics. B. be male because each cell has only one X chromosome. C. not survive. D. be female because each cell lacks a Y chromosome.