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Speciation is the EVOLUTION of a NEW SPECIES from an EXHISTING SPECIES. If two populations are seperated so the flow of alleles stops (e.g geographic isolation- a physical barrier that prevents the 2 from br...

Sex linkage is a type of genetic disease, where the gene with the faulty allele is carried on the X chromosome. Women have 2X chromosomes whilst men only have 1. Consequently if the diseased allele is recess...

Active immunity is happens due to the contact of lymphocytes with pathoges (or simply their antigens), which triggers the specific immune response and immunological memory is produced (T-Memory cells created...

To answer this question, it is first important to understand the meaning of the word degenerate. So being an A level Biology student, you must know that genes code for amino acids . (these are the basic comp...

DNA is wrapped around proteins called histones, to form nucleosomes. Each nucleosome is a histone octomer composed of (H2A, H2B, H3, and H4) subunits with a 1.65 helical turn of 147 nucleotide bases. Nucleos...