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Archaea 

Bacteria

Eukaryota

Firstly it is always good to relate such a concept with an example that is easily remembered and therefore easily applied. Alleles refer to alternate forms of the same gene, which code for a particular tr...

Heterozygous means that the parents both carry a dominant allele (A) and a recessive allele (a).

Dominant alleles are always expressed in the phenotype. Recessive alleles are expressed in the pheno...

1. Action potential arrives at axon terminal of presynaptic neuron

2. Voltage-gated Ca2+ channel opens

...

This system is made up of two main components: the heart and the vasculature.  The heart is an organ with two sides, each of which is dedicated to carry out a different job.  The right side receives deoxy...