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Mutations in the rII region of a bacteriophage T4 prevent its growth on E. coli strain K. You obtain numerous mutations in this region and want to determine how many genes are located there. You perform double infections of E. coli K with the different pairwise combinations of mutations both in cis and in trans-configuration. (Recall that cis-configuration means that two mutations are located in the same phage genome, and trans means that they are located in different genomes).
Cis-test Trans-testrIIA rIIB / + + ==> growth rIIA + / + rIIB ==> growthrIIA rIIC / + + ==> growth rIIA + / + rIIC ==> growthrIIB rIIC / + + ==> growth rIIB + / + rIIC ==> no growthrIIA rIID / + + ==> no growth rIIA + / + rIID ==> no growth
What can be concluded from this experiment?
strain of flies carrying the dominant eye mutation Lobe on the second chromosome was crossed with a strain homozygous for the second chromosome recessive mutations smooth abdomen and straw body.
The fraggles are a population of mythical, mouselike creatures that live in underground tunnels and chambers beneath a large vegetable garden that supplies their food.
The same domains and/or motifs are found in many proteins. In fact, a protein's tertiary structure is more conserved (stays the same or same over many generations) than its amino acid structure.
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If a woman has blood type AB and her husband has blood type O, what is the percent chance that a child of theirs would have blood type A? (Hint: punnett square would be useful)
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Blue eyes (b) are recessive to brown eyes (B). In a population of Swedes 64% of the individuals have blue eyes. In a population of Armenians, 9% of the individuals have blue eyes.
Some people have extra copies of chromosome 21, 13, or 18. These extra chromosomes always result in traits not adaptable to current environment. Does this suggest that extra copies of chromosome 21, 13, or 18 are more toxic than extra copies of ot..
Biotechnology permits the use of living organisms or their processes for human needs or purposes. Currently, this topic includes such general examples as cloning,
Imagine that adults in some population of monkeys appeared to pick up new innovations (for example, potato washing, stone play) from observing others. How might you disentangle vertical, horizontal, and oblique cultural transmission as possible ex..
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