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A true-breeding black goose from Nova Scotia is crossed with true-breeding black goose from Japan, producing F1 offspring that are all gray. The F1s are intercrossed, producing F2s with the following phenotypes: 37 gray and 29 black. Other research has revealed that feather color is controlled by two genes in geese. What type of epistasis best fits this phenotypic ratio?
A) Dominant epistasis B)Duplicate recessive epistasis C)There is no epistasis in this cross. D)Recessive epistasis E)Duplicate dominant epistasis
Why could prokaryotes quickly reinfect a patient if they are not wiped out? How may this result in the evolution of drug-resistant pathogens.
What is the relationship between an increase in light intensity and photosynthetic rate in leaves from a corn plant? How does this association compare with what you observed for tomato plants.
Compare and contrast prokaryotic and eukaryotic cells. If shape and colour of radishes are both due to genes with partly dominant alleles, crossing two dihybrid heterozygotes will produce how many different phenotypes.
At a talk by a visiting scientist, you learn about a strain of bakers' yeast that contains a mutation called gal1- in its galactokinase gene. Because this gene is needed to metabolize galactose, the mutant strain cannot grow in galactose medium.
A twenty-oneyear-old woman presents with a three month history of malaise, joint pain, weight loss, and sporadic fever. Her temperature is 38°C (101°F).
The resulting f1 generation consists of all tall pink flowered plants. Assume that height and flower colour is each determined by a single gene locus on different chromosomes; predict the results of an f1 cross of dihybrid plants. Select appropriate ..
A storm brings two formerly separated populations of beetles together. They look very similar. Under the biological species concept, which would show that the two populations are different species.
Choose two organelles and compare them relative to structure and function. Describe what would be the specific probable effects on the cell if each of these organelles were lost.
The altered tRNA translates the UGA as tryptophan. What nucleotide varies has probably occurred in the mutant tRNA molecule? What consequences will the presence of such a mutant tRNA have for the translation of the normal genes in this cell.
Why is the amount of oxygen consumed so much greater than the amount require to oxidize the added oxaloacetate or malate completely.
No structures needed but show all the substrates involved in each reaction and the name of the enzyme. Changed mechanism of the transmission of infectious bacterial diseases with examples.
Protein transport into the endoplasmic reticulum or mitochondria needs unfolding the protein and threading the amino acid chain through a channel or pore into organelle.
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