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What are the 3 ingredients required for evolution to occur?

For a trait to evolve, firstly, there has to be genetic variation among individuals, which will lead to differences in phenotype and cause differences in fitness in a particular environment. These difference...
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Answered by Ana D. • Biology tutor
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Where does the kreb's cycle take place?

In the matrix of the mitochondria
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Answered by Tamara O. • Biology tutor
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What is an ecosystem?

A natural unit consisting of biotic and abiotic factors and their interaction with each other
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Answered by Tamara O. • Biology tutor
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What is the risk of a child inheriting haemophilia A, when both parents are unaffected, but the mothers father suffered from the condition?

If the mother’s father had haemophilia the mother must carry the allele for the condition, as the mother must receive an X chromosome from her father. Therefore, the X chromosome received from her mother mus...
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Answered by Robert D. • Biology tutor
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How do I work out a genetic cross?

Note the phenotypes of the parents, work out whether they are homozygous or heterozygous. Choose letters to represent the alleles. The upper case letter should represent the dominant alleles and the lower ca...
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Answered by Hannah D. • Biology tutor
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