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What is the difference between a recessive and dominant allele?

Alleles are different versions of a gene . Every person has two alleles for each gene (one from either parent). For example, the gene which determines eye colour can either have an allele for brown eyes or a...
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Answered by Elisha J. • Biology tutor
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How does writing reflect the audiences and purposes for which it was intended ?

An audience is the group of people the writer is addressing. There are 3 main purposes for writing: (examples in text messages) 1) To inform: "not coming over tonight. Sorry x" 2) To persuade: &quo...
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How could species have evolved from an ancestor such as Archaeopteryx?

When the population of a species is separated, each group is put under different selection pressures due to differing environments. In each population there is genetic variation, and more offspring are produ...
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Answered by Heather J. • Biology tutor
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Which prepositions take the dative?

Aus, bei, mit, nach, seit, von, zu, gegenueber.
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Answered by Sophie F. • German tutor
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A musical instrument produces a sound wave with a frequency of 1000 Hz. The sound wave has a wavelength of 0.34 m in air. Calculate the speed of the sound wave in air.

From the equation for speed: Speed = frequency * wavelength => v = 1000 * 0.34 = 340 metres per second
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Answered by Laura D. • Physics tutor
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