BIOL201 Lecture Notes - Oogenesis, Spermatogenesis, Chromosome
11 Apr 2014
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Because crossovers do not occur during spermatogenesis in drosophila all of the f2 will get a parental chromosome from the f1 males. Crossovers do happen during oogenesis in drosophila so we will get some recombinants. The ebony gene is at 3-70. 7 and the rough gene is at 3-91. 1. Because the genes are 20. 4 mu apart 20. 4% of the f2 will get a recombinant chromosome from the f1 females. Question 2 on the drosophila genetic map notice that all of the genes on the fourth chromosome are at the same location, 0. 0. Notice also that the y chromosome isn"t even shown. During oogenesis there are no crossovers on chromosome 4. The y chromosome isn"t shown because there are few genes on it and because these genes can"t get mapped using crossovers because crossovers do not occur during spermatogenesis in flies. Biology 207 - practice questions 8 - recombination mapping.
