Answer:
Genetic drift is a mechanism of evolution in which allele frequencies of a population change over generations due to chance (sampling error).
Genetic drift occurs in all populations of non-infinite size, but its effects are strongest in small populations.
Genetic drift may result in the loss of some alleles (including beneficial ones) and the fixation.
Genetic drift can have major effects when a population is sharply reduced in size by a natural disaster (bottleneck effect) or when a small group splits off from the main population to found a colony (founder effect).
The answer is continuity theory. According to this theory, adults in their later stages will maintain and conserve the activities, relationships, as well as behavior, as they did in the earlier stages of their lives. Older people try to maintain their lifestyle, and their past experiences influence the strategies which they adapt to adjust to the old age.
The sympathetic nervous system is responsible for the reactions triggered on seeing a burglar. It is a part of the autonomic nervous system. The response triggered by the sympathetic nervous system is known as the 'fight-or-flight response'. This response is triggered in the situations of perceived threat, where the threat to one's survival occurs.
Hence, the answer is 'sympathetic nervous system'.
A mnemonic device is a tool to help you remember lists of important information such as the eight levels of organisation below. Mnemonics use a system of rhymes, phrases, acronyms or diagrams. Rhymes and phrases use the first letter of every word that needs to be remembered. The eight levels of biological organisation are:1. Domain2. Kingdom3. Phylum4. Class5. Order6. Family 7. Genus8. Species.
A phrase that can be used to remember the levels of organisation is:Do Kings Please Catch Old Fish Go Surfing?<span>
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Most eukaryotic cells that are not involved in the production of gametes undergo mitosis. These cells, known as somatic cells, are important to the survival of eukaryotic organisms, and it is essential that somatic parent and daughter cells do not vary from one another.
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