Sex_linkage - Chromosom llnh ritance f ex Humans and...

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Unformatted text preview: Chromosom llnh ritance f ex Humans and Drosophila XIX2 9 cross to XY 0‘ gametes gametes Genotypes Phenotypes xx 1/2 9 XY 1/2 8 1) X and Y chromosomes of o‘ are paired but NOT homologous. _ 2) X chromsomes of 2 are homologous but not identical. 3) Are the two possitlle 2 zygotes genetically identical? 4) Imagine chromosome X1 of the mother carries a recessive gene which causes Duchenne’s muscular dystrophy :- a) What are the phenotypes of 4 possible children? b) Are all the daughters equally likely to have sons with DMD? 13 mdund/Ocdj aw gz X5: :2. £23 .flm, x ”E: :3 $333)»; 3.3? .13 kid... u :0: H 3 32/6 if -35 + Add... .3qu 3.66.3 440 yifi KO XITOD X+3 m 0.4.4,? 0|, 43.. Tm Int f X I? wvnjd 4d.— jd _w Th. KO x+n5 do: +0. X +3 LO. wflEuw 43: on K0 #2; v.27 ...
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