Interrupted mating experiments were performed using three different Hfr strains (1-3). The three strains have different combinations of selectable markers. The time of entry for markers for each strain is shown is shown in the table given.

Hfr 1	Phe (5)	Trp (35)	Met (50)	Ala (52)
Hfr 2	Trp (2)	Val (12)	His (57)	Pro (87)
Hfr 3	Ala (10)	Met (12)	Val (37)	Phe (57)

Using the above data, predict the correct sequence of markers on the E. coli chromosome

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#Question id: 31165

#Unit 7. System Physiology – Animal

What happens during overshoot? 

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#Question id: 4980

#Unit 11. Evolution and Behavior

If an increase in dicynodont species diversity (i.e., number of species) occurred soon after the Permian extinction, and if it occurred for the same general reason usually given for the increase in mammalian diversity following the Cretaceous extinction, then it should be attributed to

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#Question id: 32300

#Unit 1. Molecules and their Interaction Relevant to Biology

Identify the structure shown

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#Question id: 12971

#Unit 10. Ecological Principles

One group of ecologists has suggested that producers are limited by competition for resources, primary consumers (herbivores) are limited by predation, and secondary consumers (carnivores) are limited by food. If this were true, at which of the following trophic levels would one expect to find substantial evidence for competitive exclusion?

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#Question id: 13103

#Unit 13. Methods in Biology

With the help of DNA fingerprinting which can be used to determine paternity. There are three babies (Baby A, Baby B and Baby C) in a maternity ward, and three sets of confused and worried parents. (Father and Mother #1 are a couple, as are Father and Mother #2, and Father and Mother #3.) 

You do each PCR reaction and load each one into a separate well of an agarose gel, and then run the gel.

 

 

Why is it that some people show only one band?