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What is natural selection?

Within a population of a species there is great geetic variation giving rise to variation in their phentoypes. Some phenotypes enable an organism to be better adapted to its environment than other members of...
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Answered by Sabrina A. • Biology tutor
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What is the difference between sexual reproduction and asexual reproduction?

Sexual reproduction involves the fusing of 2 gametes (male and female). This results in a variety of offspring as the genetic information is mixed. Asexual reproduction requires only1 parent. Offspring are a...
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Answered by Catherine T. • Biology tutor
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What is an antibiotic and how does it work?

Antibiotics are drugs prescribed to people to fight bacterial infections. They work in the body to target specific bacteria that are circulating or found withing tissues, but cannot work within cells (for ex...
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Answered by Catherine T. • Biology tutor
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What is a test cross (Genetics)?

In genetics, sometimes it is not easy to tell if an organism is heterozygous (having two different alleles of a gene) for a certain trait or if it is a homozygous (having the same identical alleles of a gene...
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Answered by Alisa H. • Biology tutor
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Explain how nerve impulses are transmitted along and between neurones

Transmitting Along Neurones When a nerve cell is not stimulated, it is in a resting state. During this state, the inside of the axon is relatively more negative than outside of the axon, this is called the r...
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Answered by Alisa H. • Biology tutor
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