Study sets, textbooks, questions
Upgrade to remove ads
Exam #1 Qian Chen
Terms in this set (51)
Mendel proposed the existence of gene linkage through his classical experiments
Which types of phenotypic ratios are likely to occur in crosses when dealing with a single gene pair for which all the genotypic combinations are of equal viability?
In Mendel's genetic analysis, he assumed that two genes assorted independently.
Co-transduction of genes is an indication that the genes are linked.
An Hfr cell can convert another E. Coli to F+
In our study of yeast pkd2 gene, we discovered that a pkd2 mutation rescued the lethal phenotype of a sid2 mutation. Sid2 is another yeast gene that we are interested in. The relationship between these two genes is called ____ in genetics.
You observe a 9:7 ratio of visible types in the F2 generation of a cross between two homozygous lines of corn. Choose the correct statement(s) about this result.
9/16 of the progeny appear to have a dominant allele at both genes
Our lab studies a gene called pkd2. In human, loss of function mutations of just one copy of pkd2 gene will lead to polycystic kidney disease. Therefore these pkd2 mutations are
In the fruit fly, Drosophila melanogaster, a spineless (no wing bristles) female fly is mated to a male that is claret (dark eyes) and hairless (no thoracic bristles). Phenotypically wild-type F1 female progeny were mated to fully homozygous (mutant) males, and the following progeny (1000 total) were observed.
Phenotypes Number Observed
claret, spineless 130
claret, hairless 309
hairless, claret, spineless 32
hairless, spineless 12
Which gene is in the middle?
How many different types of gametes can be produced by an individual with the genotype AaBbCCddEeFf?
The nonfunctional form of a gene is called a wild-type allele.
A recessive allele in tigers causes the white tiger. If two normally pigmented tigers are mated and produce a white offspring, what percentage of their remaining offspring would be expected to have normal pigmentation?
Name the general category into which double-stranded circular extrachromosomal DNA elements such as F factors would fall
Time mapping is performed in a cross involving genes ara, thr, gal and lac. The recipient cells are auxotrophic for all four genes. After 25 minutes transfer is interrupted, with the results shown below.
20% are thr+;
90% are lac+;
80% are ara+;
none are gal+.
What is the position of these genes relative to the origin (O) of the F factor and to one another
O, lac, ara, thr, gal
Color blindness is caused by a recessive X-linked allele. A man with this disorder
must have inherited it from his mother
Mendel derived the principle of independent assortment of characters to describe the patterns of inheritance that he saw when observing two or more traits. For which of the following situations does this principle NOT work?
When genes for the two traits are close together on a single chromosome
If 80% of mutant individuals exhibit a wild-type like phenotype, the penetrance of this mutant gene is
In a bacteria genetics experiment, what is the best way to quantify the number of cells in a liquid culture
making dilution series
_____ is an example of genetic transmission that is an exception to Mendel's rules
Transmission of mitochondrial DNA
Davis U-Tube was first used to demonstrate ___ is required for bacterial conjugation:
In order to determine the order of three genes in a chromosome, you would need to determine the frequency of_____ among their alleles after a genetic crossing
Which is NOT true of virus capsids?
Enters host animal cells together with the nucleic acid
The "interrupted mating technique" provides a genetic map in Drosophila
The cross GE/ge X ge/ge produces the following progeny: GE/ge 404, ge/ge 396, gE/ge 97, Ge/ge 103. From these data, one can conclude that there are 20 map units between the G and E loci.
One result of X-linkage is a crisscross pattern of inheritance in which sons express recessive genes of their fathers and daughters express recessive genes of their mothers.
Bacteriophages engage in two interactive cycles with bacteria. What are these cycles?
lytic and lysogenic
In three Hfr x F- crosses (all Hfr strains derived from one F+ strain), the first three markers of transfer from interrupted mating experiments are as follows:
The order of genes on the circular bacterial chromosome is
Compared to F+ bacteria cells, Hfr cells have
Higher recombination frequency
Which of the following condition is NOT essential for the success of Gregor Mendel's genetics experiments?
He did his work in isolation
In a Davis tube experiment, a disk separated two bacterial strains but it allowed ______ to pass through.
Name two forms of recombination in bacteria
conjugation and transduction
Assume that a cross is made between AaBb and aabb plants and that the offspring fall into approximately equal numbers of the following groups: AaBb, Aabb, aaBb, aabb. These results are consistent with.
Assume that a dihybrid cross (AaBB X AaBB) is made in which the gene loci are autosomal, independently assorting, and incompletely dominant. What phenotypic ratio would you expect from such a cross?
Phenotypically wild-type F1 female Drosophila, whose mothers had light eyes (lt) and fathers had straw (stw) bristles, produced the following offspring when crossed to homozygous light-straw males. The map distance between the light and straw loci is ___.
The Bombay phenotype is a result of
failure to produce the precursor of the antigens
Assuming independent assortment, what portion of the offspring of the cross AaBbCcDd X AabbCCdd will have the aabbccdd genotype
What is the phenotype of a fruit fly whose genotype is g+/g+ vs/vs. g = gray body and vs = vestigial wings; wild type = black body and normal wings
black body; vestigial wings
If two genes are far apart on the same chromosome they behave as if independently assorting in crosses
When two genes fail to assort independently, the term normally applied is
Which of the following is not essential to map genes in eukaryotes
crossover between sister chromatids
To map the order of three genes on a chromosome, how many possibilities shall you consider assuming there is no orientation among the genes?
F plasmid is often the source of multi-drug resistance by bacteria
Transduction is a form of recombination in bacteria that involves
Cindy has blood type AB. Assuming that no one in the family has the Bombay Phenotype, which of the following blood types could her biological parents have?
father type a, mother type b
For conjugation of bacteria, which of the followings is required
In a plant species, if the P allele (purple flowers) and the p allele (white flowers) are incompletely dominant (Pp is light purple), what offspring ratio is expected in a cross between a purple-flowered plant and a white-lowered plant?
all light purple
The following pedigree represents the inheritance pattern of a specific genetic trait in humans. Assume the trait is common in the population. This disorder is most likely inherited in which of the following ways?
X-linked recessive trait
In meiosis, the crossover events usually occur between
Two non-sister chromatids
Our lab is trying to introduce the DNA coding the yeast pkd2 gene into bacteria. Which of the following approaches will be the most efficient to carry out this experiment?
The presence of more than two alternative forms of a given gene would be called
In studies of human genetics, usually a single individual brings the condition to the attention of a scientist or physician. When pedigrees are developed to illustrate transmission of the trait what term does one use to refer to this individual?
Sets with similar terms
Molecular Genetics- EXAM 1
Genetics-Exam 1 (Binninger)
Other sets by this creator
exam 3 mol gen
Cardiac Dysthymia Vocab Assignment 3
BIOLOGY 2160 Lab Practical
Other Quizlet sets
Theo Ch 2 Test
World Literature 2 Final (Lectures 8-9) Pt. 1
Complementary and Alternative Medicine Ch. 30 P.680