BIO152H5 Lecture Notes - Lecture 1: Antirrhinum, Epistasis, Mendelian Inheritance

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14 Nov 2016
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The heterozygotes have an intermediate phenotype since alleles of a gene are not always clearly dominant or recessive. E(cid:454)a(cid:373)ple: a (cid:272)olor i(cid:374) s(cid:374)apdrago(cid:374)s a(cid:374)d four o"(cid:272)lo(cid:272)k flo(cid:449)ers (cid:894)(cid:448)aries(cid:895) F2 generation: 1 red, 2 pink and 1 white. R allele: has functional enzyme for producing red pigment r allele: has a non-functional enzyme for pigment production (produces no color), therefore (cid:272)a(cid:374)"t s(cid:455)(cid:374)thesize red pig(cid:373)e(cid:374)t. Rr results in pink, not red or white. Produces a heterozygote phenotype that is a combination of that of the two homozygotes. Dominant alleles are not always the more common alleles in a population. Recessive allele for 5 digits is more prevalent than dominant allele. If a trait is dominant, you only need one allele present. 3 alleles as a result of 2 carbohydrates blood group genotypes and phenotypes (6 possible genotypes resulting in four different phenotypes. 4 types of blood groups: a, b, ab, o. A single gene located on chromosome 7 causes disease.

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