[17.2/4] monohybrid + dihybrid inheritance
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what does it mean for the phenotype offspring if the alleles are GG, Gg and gg, where green is dominant and yellow is recessive?
• GG = green • Gg = green • gg = yellow
what is the difference between the genotype and gamete? (eg. for GG and gg)
• parental genotype = GG / gg • gamete is what is produced by each parent = G, G / g, g
how do you find the F1?
• punnett square with 4 separate alleles • cross to find alleles of offspring
what is F2?
• when F1 offspring are bred • resulting phenotypes may be different
what is an example of dihybrid inheritance with mendel’s peas?
• seed shape: round shape is dominant to wrinkled shape • seed colour: yellow colour is dominant to green colour
F1 for dihybrid inheritance
• have 2 sets of parental phenotypes which have 4 letters each • find gametes from these (somehow) • find offspring genotype parental genotype = RRGG, rrgg gametes = RG, rg offspring (F1) gentyopes = RrGg
F2 for dihybrid inheritance with 2 heterozygous parents
• big 16 grid • 4 possible offspring phenotypes • ratio of offspring (F2) phenotypes = 9:3:3:1 gametes = RG, Rg, rG, rg
F2 for dihybrid inheritance with 2 homozygous recessive parents
• big 16 grid • 4 possible offpsring phenotypes gametes = Rg, Rg, rg, rg