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Variation is present in a population, this can either be genetic variation or due to mutations. A selectional pressure causes a stuggle for existance. Selectional pressures can come from a predator, disease ...

In adult cell cloning, an egg cell is taken from a donor animal - such as a sheep - and it is enucleated. This means that the nucleus which contains all of the genetic information of the sheep is removed fro...

First we must understand the question and what it is asking from us. Thermal energy is just heat and the question is asking how can heat spread from one side of the metal to the other. Well if we look at the...

Nervous communication is short range whereas hormonal communicaiton is long range ( acts over whole body) Nervous communication is much faster than hormonal communication (has to pass through the blood)

Alleles can be either dominant or recessive. Dominant alleles are always expressed - even if there is only one copy present - that is it can be heterozygous or homozygous. Recessive alleles are only expresse...