Genes on Chromosomes

Genes on Chromosomes - Genes on Chromosomes chromosomal...

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Genes on Chromosomes chromosomal theory of inheritance - similar chromosomes pair w/ each other during meiosis segregation/independent assortment shown by meiosis I number of traits for each organism always more than number of chromosomes Thomas Hunt Morgan - performed experiments w/ red/white eyed flies o found evidence of sex-linked inheritance o proved that genes for traits are found on chromosomes males - X/Y chromosomes females - X/X chromosomes sex-linked trait - found on the X chromosome genetic recombination - crossing over mixed up genes further physical exchange of chromosomal arms crossing over can occur anywhere along the chromosome more likely that crossing over occurs between chromosomes that are far apart genetic map - measures distance between genes in terms of recombination frequency o centimorgan - map unit, distance within which a crossover is expected to happen in 1% of gametes three-point cross - involves 3 linked genes (genes so close that they don’t assort
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Genes on Chromosomes - Genes on Chromosomes chromosomal...

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