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the drosophila allele (by) determines the mutant phenotype blistery wings and the wild type allele (by+) determines normal wings. At another gene, the allele (ss) determines the mutant phenotype spineless bristles and the wild type allele (ss+) determines spiny bristles. A female fly that is heterozygous for both genes is crossed with a male that has blistery wings and spineless bristles. Four different phenotypes are seen in the progeny, in the following numbers:
normal wings by+, spiny bristles ss+ 222by+, spineless bristles ss 23blistery wings by, ss+ 27by, ss 228
a. estimate the distance in centiMorgans between these genes
b. write out genotypes of each parent and each of the 4 offsprings. notation of genotypes should indicate which alleles share the same chromosome. for each offspring indicate whether it arose from a parental gamete or a recombinant gamete.
c. is the female parent in coupling or repulsion phase.
A corporation has invented a new low-calorie sugar substitute. They wish to determine if the substitute might be carcinogenic, so they use it in the Ames test with Salmonella his mutants.
Chickens have ZZ-ZW sex determination. The bar-feathered phenotype in chickens results form a Z-linked allele that is dominant over the allele for nonbar feathers. If a barred female is crossed with a non-barred male, what will be the phenotypes o..
Will a person suffering from dehydration have urine with high or low specific gravity? What will happen to specific gravity when a person drinks large amount of water?
define conduction velocity.
Describe the three kind of the recombination among microorganisms. DNA is transferred horizontally among same generation. The phenotype of gene at end of recombination will be changed.
Smoking has been linked to many respiratory diseases and many states have made smoking illegal in public places.
Which of the following are secondary sex characteristics in females?
Describe the direction of blood flow and the type of blood oxygenated or deoxygenated for each vessel in the pulmonary and systemic circuits.
Lithops, also called Stoneplants, are a type of plant that resembles little stones. These plants have the ability to blend in with their surrounding, which affords them protection from predators. If you were in an area containing Lithops.
Another dog, Billy, has three restriction sites for this enzyme in his genome. For this problem suppose there is only one chromosome in dogs.
The D. melanogaster genome consists of approximately 1.7 x 108 base pairs. If DNA synthesis occurs at a rate of 40 base pairs per second, and the entire genome is replicated in 10 minutes, how many bidirectional origins of synthesis are required t..
I in brief describe how a mutation might alter gene function (at the molecular level) if it fell into the following categories. As an example, a neomorphic mutation could result from expressing a gene in a novel location.
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