Trihybrid cross

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Trihybrid cross

  1. 1. Trihybrid cross AAPD2BB
  2. 2. • The mating of two individuals, organisms, or strains that have different gene pairs that determine three specific traits or in which three
  3. 3. Example:23 = 8 * 8 = 64MEANING:• The fork line method can be used by figuring the occurrence of each gene or set of genes to be found in the gamete, and then multiply them together.• This can be multiplied by figuring each trait or combination of traits separate for both the male
  4. 4. P1: WWGG * ww ggF1: Ww Gg * Ww GgF2: Ww * Ww Gg * Gg WW Ww Ww ww GG Gg Gg ggPhenotypes: ¾W ¾ G = 9/16 WG ¼ g = 3/16 Wg ¼ w ¾ G = 3/16 wG ¼ g = 1/16 wgPhenotypic ratio: 9:3:3:1
  5. 5. Genotypes: ¼ GG = 1/16 WW GG ¼ WW 2/ Gg = 2/ WW Gg 4 16 ¼ gg = 1/16 WW gg ¼ GG = 3/16 Ww GG 2/4 Ww 2/ Gg = 4/ Ww Gg 4 16 ¼ g = 2/16 Ww gg ¼ GG = 1/16 ww GG ¼ ww 2/ Gg = 2/ ww Gg 4 16 ¼ gg = 1/16 ww gggenotypic ratio: 1:2:1:2:4:2:1:2:1

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