Day 5_ 4-21-2021-Manika Chaulagain.docx - Warm up I don’t...

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Warm upI don’t know what questions were in warm-up because i didn’t attend class today.AS video notesPolygenic worksheetDifferences in skin color are largely due to differences in the amount of melanin, a darkpigment produced by skin cells.At least three genes control the synthesis of melanin.Each gene has two forms: an allele for high melanin production, or dark skin (A,B,C),and an allele for low melanin production, or light skin (a,b,c). Each dark skin allele(A,B,C) in the genotype adds a small but equal amount of pigment to the skin. Thereare seven different shades of skin color ranging from very dark (AABBCC) to very light(aabbcc). Most individuals produce a medium amount of melanin and are ofintermediate skin color (AaBbCc).The following Punnett square shows the possible offspring from a cross between twoindividuals of intermediate skin color.AaBbCc X AaBbCcGametesABCABcAbCAbcaBCaBcabCabcABCAABBCCAABBCcAABbCCAABbCcAaBBCCAaBBCcAaBbCCAaBbCcABc
AABBCcAABBccAABbCcAABbccAaBBCcAaBBccAaBbCcAaBbccAbCAABbCCAABbCcAAbbCCAAbbCcAaBbCCAaBbCcAabbCCAabbCcAbcAABbCcAABbccAAbbCcAAbbccAaBbCcAaBbccAabbCcAabbccaBCAaBBCCAaBBCcAaBbCCAaBbCcaaBBCCaaBBCcaaBbCCaaBbCcaBcAaBBCcAaBBccAaBbCcAaBbccaaBBCcaaBBccaaBbCcaaBbccabCAaBbCCAaBbCcAabbCCAabbCcaaBbCCaaBbCcaabbCCaabbCcabcAaBbCcAaBbccAabbCcAabbccaaBbCcaaBbccaabbCcaabbccThe offspring of this cross exhibit seven shades of skin color based on the number ofdark skin alleles in each genotype.

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