BIOL-1030 Lecture Notes - Lecture 9: Dihybrid Cross, Blending Inheritance, Punnett Square

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14 Nov 2016
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Me(cid:374)del"s se(cid:448)e(cid:374) pea t(cid:396)aits: only seven selected because of chromosome number of pea plants, diploid plants, pea plants have 7 pair of homologous chromosomes. Genotypic ratio = 1 pp : 2 pp : 1 pp. Phenotypic ratio = 3 purple : 1 white. 1859 charles darwin published his theory on the origin of species. 1866 gregor mendel published his particulate theory of inheritance. 1882 walter flemming dis(cid:272)o(cid:448)e(cid:396)ed (cid:862)(cid:272)olo(cid:396)ed (cid:271)odies(cid:863) (cid:894)i. e. (cid:272)h(cid:396)o(cid:373)oso(cid:373)es(cid:895) i(cid:374) (cid:396)elatio(cid:374) to (cid:373)itosis. First to use stains that specifically bound to and allowed visualization of chromosomes. 1902 walter sutton observed chromosomes in relation to meiosis. Ho(cid:449)ed that (cid:272)h(cid:396)o(cid:373)oso(cid:373)es o(cid:271)e(cid:455)ed me(cid:374)del"s la(cid:449)s of i(cid:374)he(cid:396)ita(cid:374)(cid:272)e. Uggested that (cid:272)h(cid:396)o(cid:373)oso(cid:373)es a(cid:396)e the (cid:272)a(cid:396)(cid:396)ie(cid:396)s of me(cid:374)del"s he(cid:396)ita(cid:271)le fa(cid:272)to(cid:396)s. 1909 wilhelm johannsen the fi(cid:396)st pe(cid:396)so(cid:374) to use the te(cid:396)(cid:373) (cid:862)ge(cid:374)e(cid:863) Genes on the same chromosome tend to be. Inherited together: 1908 william bateson & reginald. Punnett: o(cid:271)se(cid:396)(cid:448)ed dih(cid:455)(cid:271)(cid:396)id (cid:272)(cid:396)oss (cid:396)esults i(cid:374) s(cid:449)eet pea that did (cid:374)ot o(cid:271)e(cid:455) me(cid:374)del"s la(cid:449) of i(cid:374)depe(cid:374)de(cid:374)t.

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