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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 differe...

In the matrix of the mitochondria

A natural unit consisting of biotic and abiotic factors and their interaction with each other

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 ...

1. Note the phenotypes of the parents, work out whether they are homozygous or heterozygous.
2. Choose letters to represent the alleles. The upper case letter should represent the dominant allele...