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3 years ago

What causes variations in asexual organisms?

1 answer:

7 0

<span>In asexual organisms variation can occur from a variety of sources - mutations, homologous recombination and plasmid transfer. Mutations occur at a rate of roughly one base per million, meaning you would get between 0.1 and 10 in bacteria due to the size of their genomes.

In sexually reproducing organisms there are mutations and the crossing of gametes. The mutations occur in a near identical way to in asexual reproducing organisms as long as they occur in germline cells.

Asexually reproducing organisms reproduce much, much faster and so variation can occur more rapidly. For example the variation in the HIV viral propulation in an individual after 5 years is an immense diversity, higher than all the diversity that the human population has managed in thousands of years.</span>

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Compare and contrast properties of sister chromatids and homologous chromosomes. drag the appropriate items to their respective

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3 years ago

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3 years ago

Put the following statements about a synapse in the correct order.

Fiesta28 [93]

Answer:

Action Potential reaches the Axonal terminal

Vesicles filled with neurotransmitters move to the end of the axonal terminal

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Neurotransmitters attach to the sodium channels on the dendrite.

Sodium channels open

Sodium moves into the Dendrite

Action potential travels through the dendrite

Explanation:

The process of transmission of action potential across a synapse ( a junction between two neurons) begins with the arrival of an action potential from the presynaptic neuron. The steps are given below:

Action Potential reaches the axonal terminal of the presynaptic neuron

Vesicles filled with neurotransmitters move to the end of the axonal terminal of the presynaptic neuron

Neurotransmitters are released into the synaptic cleft

Neurotransmitters attach to the sodium channels on the dendrite of the postsynaptic neuron

Sodium channels open

Sodium moves into the dendrite of the postsynaptic neuron.

Action potential travels through the dendrite towards an effector or another neuron.

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