Substitution of one base pair for another in a coding region of a gene can result in a ____ mutation
where the changed codon codes for a stop codon where an amino acid was previously coded for.
a. missense
b. chromosomal
c. frameshift
d. silent
e. nonsense
E
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The human population is now over 6.8 billion. It reached 6 billion in _____
a. 2007 c. 1802 b. 1999 d. 1350
Identify the following as either specific or nonspecific immune responses, and for each provide a onesentence
explanation of its function or role. A. macrophages B. natural killer cells C. memory cells What will be an ideal response?
Meiosis involves
A) one round of chromosomal replication and one nuclear division. B) one round of chromosomal replication and two nuclear divisions. C) two rounds of chromosomal replication and one nuclear division. D) two rounds of chromosomal replication and two nuclear divisions. E) the number of rounds of chromosomal replication and nuclear divisions depends on whether the cell is haploid or diploid.
Suppose that you examine a vial of 100 flies that are all offspring from a single genetic cross, and you find only red-eyed females and red-eyed males present. You allow these flies to interbreed, and in the next generation you find all the females are red-eyed, but you find both red-eyed and white-eyed males. The allele for red eye colour (Xw+) is dominant over the allele for white eye colour (Xw). Which of the following best describes the genotypes of the original parents?
a. Xw+Xw+; XwY b. Xw+Xw; Xw+Y c. Xw+Xw; XwY d. XwXw; Xw+Y