The chromosomal basis of inheritance (article) | Khan Academy - Fruit fly dna sex chromosomes genes
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5. Genetic inheritance follows rules. 6. Genes are real things. 7. All cells arise from pre-existing cells. 8. Sex cells have one set of chromosomes; body cells have. Drosophila genes are traditionally named after the phenotype they cause when mutated. or synthesized, due to a point mutation on chromosome II. He also noted its inheritance is connected to the sex of the fly and of the DNA required for correct development of the wings.