DNA - Inheritance of Multiple Traits An example using 2...

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An example using 2 traits in Mendel’s peas One gene determines seed color o Y   is the dominant form or allele o y   is the recessive allele One gene determines seed shape o S   is the dominant allele o s   is the recessive allele Punnet Square o Shows 4 possible combinations of alleles in gametes of parents SY, Sy, sy, sY o Shows 16 allele combinations in offspring  9 will have smooth, yellow seeds 3 will have smooth, green seeds 3 will have wrinkled, yellow seeds 1 will have wrinkled, green seeds There are 4 possible allele combinations in gametes SY, Sy, sy, sY There are 16 possible allele combinations in offspring Traits determined by these two alleles occur in offspring in 9:3:3:1 ratio 9 Offspring will have smooth, yellow seeds SsYY, SSYs, SsYy SsYY, SSYy, SsYy SyYy, SsYY, SsYy 3 Offspring will have smooth, green seeds Ssyy, Ssyy, Ssyy 3 offspring will have wrinkled, yellow seeds ssYy, ssYy, ssYY 1 offspring will have wrinkled, green seeds ssyy Example: If a plant heterozygous for both flower color (R) and height (T) is self-fertilized,  give the proportions of genotypes and phenotypes produced. The plant is heterozygous for two genes: its genotype is 
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This note was uploaded on 04/30/2008 for the course BIO 101 taught by Professor Wetherbee during the Fall '08 term at Rhode Island.

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DNA - Inheritance of Multiple Traits An example using 2...

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