Alleles can be either dominant or recessive.
Dominant alleles show their effect even if the individual only has one copy of the genes, For example, the allele for brown eyes is dominant, therefore you only need one copy of the 'brown eye' allele to have brown eyes ;although, with two copies you will still have brown eyes.
If both alleles are dominant, it is called co-dominance. The resulting characteristic is due to both alleles being expressed equally. An example of this is the blood group AB which is the result of co-dominance of the A and B dominant alleles.
Recessive alleles only show their effect if the individual has two copies of the allele. For example, the allele for blue eyes is recessive, therefore to have blue eyes you need to have two copies of the 'blue eye' allele.
Illustration showing the inheritance of dominant and recessive alleles for eye colour.
Receptive field is a region where sensory neuron detects stimuli within an area.
<h3>What is receptive field?.</h3>
The receptive field of a neuron is the part or region in any organ system within that help to in stimulation of neurons which can affect the the electrical response of the neursons.
Examples of receptive field are found in cochlea of auditory system, visual system, skin, tongues and so on.
Therefore, Receptive field is a region where sensory neuron detects stimuli within an area.
Learn more about receptive field below.
brainly.com/question/16940018
D - Archaea
All organisms are unicellular & they live in extreme environments, like heat and salt.
Mitosis is closely controlled by the genes inside every cell. Sometimes this control can go wrong.
If that happens in just a single cell, it can replicate itself to make new cells that are also out of control. These are cancer cells.
They continue to replicate rapidly without the control systems that normal cells have.
Cancer cells will form lumps, or tumours, that damage the surrounding tissues. Sometimes, cancer cells break off from the original tumour and spread in the blood to other parts of the body.
When a tumour spreads to another part of the body it is said to have metastasised.
They continue to replicate and make more tumours. These are called secondary tumours.
So the answer should be A.) mitosis
