BIOA01H3 Lecture Notes - Lecture 29: Microsoft Onenote, Abo Blood Group System, Dihybrid Cross

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How many phenotypes would you expect among the progeny of the following genetic cross: Just one --> every one will be dominant a, dominant b, dominant c. So 4 different phenotypes --> dominant a, dominant c; dominant a, recessive c; recessive a, dominant c; recessive a, recessive c (b always stays dominant) F2 would have 8 different phenotypes (23 if there"s 3 different genes) During meiosis, you can have the 2 dominants in one gamete or 1 dominant and 1 recessive in one gamete. If ur homozygous for the red allele, ur red. If ur homozygous for the white allele, ur white. If ur heterozygous for the red and white, ur pink. Heterozygote has milder sickle-cell trait (not quite as bad, but still there) Heterozygote has no symptoms but has detectable biochemical effects. A mutation in the gene coding for beta haemoglobin reduces the ability of the red blood cells to carry oxygen.

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