Genes come in different varieties, called alleles. Somatic cells contain two alleles for every gene, with one allele provided by each parent of an organism. Often, it is impossible to determine which ...

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Marguerita is a Certified Financial Planner ...

Try these interactive flashcards based on GCSE biology past papers. By working your way through the flashcards created by experts, you can prepare for your biology exams and make your revision more ...