How many kinds of gametes will be expected from an individual with the genotype
PpCcTTRr?
In the polymerase chain reaction, what is the purpose of the initial high temperature?
What is the purpose of cooling in the second step?
What is the composition of the genetic material?
What is the common influence of ultraviolet light on DNA?
Approximately how much of the mammalian genome is composed of repetitive DNA?
Trisomics are observed in humans; monosomics are not. Why?
From the late 1950s to the mid-1960s, numerous experiments using in vitro cell-free
systems provided information on the nature of the genetic code. Briefly outline
significant experiments in the determination of the genetic code.
Within the control region of the trp operon is a section of DNA that is sensitive to levels
of tryptophan in the system. What is the name of this region?
Under certain conditions, the rate of mutation of a particular gene may be determined in
humans. What three properties of the mutation would favor the most direct
determination of mutation rate in humans?
What is meant by the term epistasis? Distinguish between epistasis and dominance. Do
not use examples in answering this question.
Name the bases in DNA and their pairing specificities.
In Drosophila, assume that the gene for scute bristles (s) is located at map position 0.0
and that the gene for ruby eyes (r) is at position 15.0. Both genes are located on the X
chromosome and are recessive to their wild-type alleles. A cross is made between
scute-bristled females and ruby-eyed males. Phenotypically wild-type F1 females were
then mated to homozygous double mutant males, and 1000 offspring were produced.
Give the phenotypes and frequencies expected.
A “marker” in a genetic sense usually represents a site along a chromosome where a
specific nucleotide sequence exists. What specific phrase is used when such markers are
identified by restriction endonucleases and a particular set of DNA fragments is
generated?
Compare and contrast the chromosome structure of viruses, bacteria, and eukaryotes.
Alleles that differ by as little as a single nucleotide can be distinguished by synthetic
probes known as ________.