Gene Interactions - Gene Interactions Most traits are...

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Gene Interactions Most traits are affected by more than one gene (and environmental factors) o Ex: height, weight, growth rate, pigmentation o Gene interaction: when two or more different genes influence the outcome of a single trait o When two genes affect two different traits, Mendel’s laws of segregation and independent assortment predict a phenotypic ratio of 9:3:3:1 o When two genes affect the same trait there are different ways the alleles can affect a trait A cross involving a two-gene interaction can produce a 9:3:3:1 ratio in offspring when four distinct phenotypes are produced o William Bateson and Reginald Punnett in 1906 investigated inheritance of comb morphology in chicken\s o Wyandotte breed and rose comb x Brahma and pea comb F1 all have walnut comb o F1 x F1 four different types of combs 9 walnut:3 rose: 3 pea: 1 single o They reason a single trait (comb morphology) is determined by two different genes o R (rose comb) dominant to r o P (pea comb) dominant to p
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This note was uploaded on 04/07/2008 for the course BIO 325 taught by Professor Saxena during the Spring '08 term at University of Texas at Austin.

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Gene Interactions - Gene Interactions Most traits are...

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